| 1. |
Tomoya Kaneko, Maiko Nishibori, The difference of PMMA-brush-modification on the oxygen permeable perovskite-type oxides by consisting elements, https://doi.org/10.1111/jace.17752, 2021.03. |
| 2. |
Kakeru Ninomiya, Kazutaka Kamitani, Yusuke Tamenori, Kazuki Tsuruta, Ken Takata, Hideaki Sawada, Keisuke Kinoshita, Maiko Nishibori, Analysis of the dynamic behavior and local structure of solid-solution carbon in age-hardened low-carbon steels by soft X-ray absorption spectroscopy, Materialia, https://doi.org/10.1016/j.mtla.2020.100876, 2020.12. |
| 3. |
Hirotaka Hara, Chao-Nan XU, Ruiping Wang, Xu-Guang ZHENG, Maiko Nishibori, Eiji Nishibori, Control of crystal structure and performance evaluation of multi-piezo material of Li1− xNaxNbO3: Pr3+, Journal of the Ceramic Society of Japan, https://doi.org/10.2109/jcersj2.20015, https://doi.org/10.2109/jcersj2.20015, 2020.08. |
| 4. |
Ryo Koba, Hayato Fujita, Maiko Nishibori, Kiyoshi Saeki, Kinuko Nagayoshi, Yoshihiko Sadakari, Shuntaro Nagai, Oki Sekizawa, Kiyofumi Nitta, Tatsuya Manabe, Takashi Ueki, Tatsuhiro Ishida, Yoshinao Oda, Masafumi Nakamura, Quantitative evaluation of the intratumoral distribution of platinum in oxaliplatin-treated rectal cancer
In situ visualization of platinum via synchrotron radiation X-ray fluorescence spectrometry, International Journal of Cancer, 10.1002/ijc.32592, 146, 9, 2498-2509, 2020.05, Oxaliplatin (l-OHP), a platinum-based drug, is a key chemotherapeutic agent for colorectal cancer (CRC), but drug resistance and toxic effects have been major limitations of its use. Synchrotron radiation X-ray fluorescence spectrometry (SR-XRF) is a rapid, nondestructive technique for monitoring the distribution of metals and trace elements in cells or tissue samples. We applied SR-XRF to visualize the distribution of platinum and other elements in 30 rectal cancer specimens resected from patients who received l-OHP-based preoperative chemotherapy and quantified platinum concentration in the tumor epithelium and stroma, respectively, using calibration curves. The platinum concentration in rectal cancer tissue ranged 2.85–11.44 ppm, and the detection limit of platinum was 1.848 ppm. In the tumor epithelium, the platinum concentration was significantly higher in areas of degeneration caused by chemotherapy than in nondegenerated area (p < 0.001). Conversely, in the tumor stroma, the platinum concentration was significantly higher in patients with limited therapeutic responses than in those with strong therapeutic responses (p < 0.001). Furthermore, multivariate analysis illustrated that higher platinum concentration in the tumor stroma was an independent predictive factor of limited histologic response (odds ratio; 19.99, 95% confidence interval; 2.04–196.37, p = 0.013). This is the first study to visualize and quantify the distribution of platinum in human cancer tissues using SR-XRF. These results suggest that SR-XRF analysis may contribute to predicting the therapeutic effect of l-OHP-based chemotherapy by quantifying the distribution of platinum.. |
| 5. |
Kakeru Ninomiya, Kazutaka Kamitani, Yusuke Tamenori, Kazuki Tsuruta, Toshihiro Okajima, Daisuke Yoshimura, Hideaki Sawada, Keisuke Kinoshita, Maiko Nishibori, Observation of Chemical State for Interstitial Solid Solution of Carbon in Low-carbon Steel by Soft X-ray Absorption Spectroscopy, isij international, 10.2355/isijinternational.ISIJINT-2019-206, 60, 1, 114-119, 2020.01, The near-edge X-ray absorption fine structure at the carbon K edge was measured for determining the chemical state of interstitial carbon in a low-carbon steel. In addition, the wavelength dependence of the photoelectron spectrum of the surface of the steel was evaluated, and a contamination and oxidation layer of 3 nm thickness was found. As a result, it was possible to observe a change in the chemical state of carbon existing in bulk iron located deeper than the oxidation and contamination layers, by evaluating the difference spectra between the sample and a reference. Furthermore, by evaluating the shape change of the difference spectra based on the heat treatment time, it was found that the chemical state of carbon in bulk iron changes with heat treatment.. |
| 6. |
Hiroyuki Yamaura, Hiroki Takahashi, Makoto Fukuoka, Maiko Nishibori, Syuhei Yamaguchi, Hidenori Yahiro, PM oxidation over Ag-loaded perovskite-type oxide catalyst prepared by thermal decomposition of heteronuclear cyano-complex precursor, Catalysis Today, 10.1016/j.cattod.2018.08.019, 83-88, 2019.07, The Ag-loaded perovskite-type oxide catalysts (Ag/LaFeO3-CN and Ag/LaFeO3-imp) were prepared using two different methods, and their catalytic activities for carbon combustion were examined. Ag loading was observed to exhibit a positive effect on the catalytic activity of carbon combustion for an Ag/LaFeO3-CN catalyst that was prepared by the calcination of an Ag-loaded heteronuclear metal cyano-complex precursor. However, Ag loading was not observed to be significantly effective in case of Ag/LaFeO3-imp that was prepared by a general impregnation method. Such a noticeable enhancement in the activity of an Ag/LaFeO3-CN catalyst was assumed to originate from both the high dispersion of Ag that was loaded on LaFeO3 and from the formation of reactive oxygen species between metallic Ag species and the perovskite-type oxide.. |
| 7. |
Tomoya Kaneko, Kohei Nosue, Tomoki Uchiyama, Masaru Nagano, Naoki Ankei, Kazutaka Kamitani, Maiko Nishibori, Oxygen sorption-desorption properties and orderdisorder transitions on LaSrCoFe perovskite-type oxides, Journal of the Ceramic Society of Japan, 10.2109/jcersj2.19033, 127, 6, 378-382, 2019.06, The oxygen non-stoichiometry (¤) and structural properties of a brownmillerite-type oxide of La0.1Sr0.9Co0.9Fe0.1O3¤ (LSCF1991) during oxygen sorption/desorption were investigated by simultaneously applying a temperature-programmed technique and high-temperature X-ray diffraction. The structural changes of perovskite-type (P-type) to brownmillerite-type (B-type) and B-type to P-type occurred within limited p(O2) ranges, and a B-type phase-stable region was observed in the presence of oxygen at high temperature. Moreover, P-type LSCF1991 changed into B-type LSCF1991 through tetragonal P-type LSCF1991 as an intermediate phase. B-type LSCF1991 showed repeating structural changes with a certain limited p(O2), which is 0.5% < p(O2) < 1.0%, whereas such changes could not be observed at p(O2) > 1.0%. These behaviors correspond with the temperature programmed desorption of oxygen profiles, as well as the amount of lattice oxygen (3¤). The p(O2) dependence of the structural change will provide a basis for a further investigation into the durability of an oxygen-permeated membrane by predicting the strain across the membrane under practical conditions.. |
| 8. |
Woosuck Shin, Kazuki Tajima, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Norimitsu Murayama, Maiko Nishibori, Tomoyo Goto, Thermoelectric gas sensors with selective combustion catalysts, Journal of the Ceramic Society of Japan, 10.2109/jcersj2.18098, 127, 2, 57-66, 2019.02, Thermoelectric gas sensors (TGSs) were developed using a series of materials combined with gas-selective combustion catalysts. The TGSs have a micro-device structure formed on a membrane-type micro-hotplate to enhance their sensitivity. The working principle of the TGSs involves a synergetic combination of thermoelectric detection and the catalytic combustion of detection gas, which can eliminate the effects of humidity and other inflammable gases, allowing highly sensitive gas detection. This paper introduces the thin-film processing and the methodology of integrating the ceramic catalyst on the micro-device for the TGSs, and the mass production of gas sensors was demonstrated in this study. The TGSs can detect a wide H concentration range of several parts per million (ppm) to percent in air, exhibiting robust sensing performance with long-term stability. We developed new applications such as breath H
2
measurement with a H
2
concentration of 0200 ppm.. |
| 9. |
Kazutaka Kamitani, Ayumi Hamada, Kazutoshi Yokomachi, Kakeru Ninomiya, Kiyu Uno, Masaru Mukai, Yuko Konishi, Noboru Ohta, Maiko Nishibori, Tomoyasu Hirai, Atsushi Takahara, Depth-Resolved Characterization of Perylenediimide Side-Chain Polymer Thin Film Structure Using Grazing-Incidence Wide-Angle X-ray Diffraction with Tender X-rays, Langmuir, 10.1021/acs.langmuir.8b01566, 34, 29, 8516-8521, 2018.07, Polymers with a perylenediimide (PDI) side chain (PAc12PDI) consist of two kinds of crystalline structures with various types of orientations in a thin film. Understanding the population of the microcrystalline structure and its orientation along the thickness is strongly desired. Grazing-incidence wide-angle X-ray diffraction (GIWAXD) measurements with hard X-rays, which are generally chosen as λ = 0.1 nm, are a powerful tool to evaluate the molecular aggregation structure in thin films. A depth-resolved analysis for the outermost surface of the polymeric materials using conventional GIWAXD measurements, however, has limitations on depth resolution because the X-ray penetration depth dramatically increases above the critical angle. Meanwhile, tender X-rays (λ = 0.5 nm) have the potential advantage that the penetration depth gradually increases above the critical angle, leading to precise characterization for the population of crystallite distribution along the thickness. The population of the microcrystalline states in the PAc12PDI thin film was precisely characterized utilizing GIWAXD measurements using tender X-rays. The outermost surface of the PAc12PDI thin film is occupied by a monoclinic lattice with a = 2.38 nm, b = 0.74 nm, c = 5.98 nm, and β = 108.13°, while maintaining the c-axis perpendicular to the substrate surface. Additionally, the presence of solid substrate controls the formation of the crystallite with unidirectional orientation.. |
| 10. |
Kenji Obata, Akane Doi, Maiko Nishibori, Kengo Shimanoe, Takuya Suzuki, Shigenori Matsushima, Morphology, microstructure, and surface area of La-added MgFe2O4 powder, Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, 10.2109/jcersj2.17270, 126, 5, 402-407, 2018.05, La-added and pure MgFe2O4 powders were prepared from a malic acid complex, and the effect of La-adding on the microstructure and specific surface area of MgFe2O4 powder were examined. There were no traces of impurity phases for pure MgFe2O4 powder in the X-ray diffraction measurement after calcination in the range of 600 to 800°C. When La atoms were added to MgFe2O4, the crystallite growth of MgFe2O4 was suppressed remarkably, resulting in a higher specific surface area in comparison with the pure material, and the lattice volume increased. X-ray photoelectron spectroscopy measurements showed that the binding energies of Mg 2s, Fe 2p, O 1s, and La 3d signals were in good agreement with the Mg2+, Fe3+, O21, and La3+ valence states, respectively. Scanning electron microscopy observations revealed that MgFe2O4 powder shows an aggregation of granular particles and that the individual particles are tightly interconnected with each other, whereas smaller particles compared with pure MgFe2O4 were observed for the La-added powder. It was found from the N2 adsorption measurement, moreover, that the amount of mesopore increases with La addition.. |
| 11. |
Yogesh Kumar Maurya, Katsuya Noda, Kazuhisa Yamasumi, Shigeki Mori, Tomoki Uchiyama, Kazutaka Kamitani, Tomoyasu Hirai, Kakeru Ninomiya, Maiko Nishibori, Yuta Hori, Yoshihito Shiota, Kazunari Yoshizawa, Masatoshi Ishida, Hiroyuki Furuta, Ground-State Copper(III) Stabilized by N-Confused/N-Linked Corroles Synthesis, Characterization, and Redox Reactivity, J. Am. Chem. Soc., 10.1021/jacs.8b01876, 2018.05. |
| 12. |
Syuhei Yamaguchi, Akinori Suzuki, Makoto Togawa, Maiko Nishibori, Hidenori Yahiro, Selective oxidation of thioanisole with hydrogen peroxide using copper complexes encapsulated in zeolite
Formation of a thermally stable and reactive copper hydroperoxo species, ACS Catalysis, 10.1021/acscatal.7b04092, 8, 4, 2645-2650, 2018.04, [Cu(terpy)]2+ complexes encapsulated into Na-Y zeolite ([Cu(terpy)]2+@Y) were prepared, and their catalytic activities for the oxidation of sulfides using hydrogen peroxide were investigated. Several spectroscopic results, as well as elemental analysis, demonstrated the formation of [Cu(terpy)]2+ complexes in supercages of Y-zeolite. [Cu(terpy)]2+@Y exhibited high selectivity for the oxidation of thioanisole into methylphenylsulfoxide when H2O2 was used. The kinetic study of this oxidation at the catalyst [Cu(terpy)]2+@Y suggests that the reaction of [Cu(terpy)]2+ species with H2O2 is the rate-determining step. The oxidation of thioanisole, benzene, and 2-phenylethylamine using [[Cu(terpy)]2+@Y]∗, which was prepared from the reaction between [Cu(terpy)]2+@Y and H2O2, quantitatively proceeded to methylphenylsulfoxide, phenol, and 2-amino-1-phenylethanol, respectively. The reaction of [Cu(terpy)]2+@Y and H2O2 was found to yield thermally stable but active CuII-OOH species in [Cu(terpy)]2+@Y.. |
| 13. |
Tomoki Kato, Masanao Sato, Hitoshi Shimamoto, Kiyu Uno, Kazutoshi Yokomachi, Yuko Konishi, Kazutaka Kamitani, Maiko Nishibori, Noboru Ohta, Ryohei Ishige, Kevin L. White, Nobuyuki Otozawa, Tomoyasu Hirai, Atsushi Takahara, Preparation of High-Density Polymer Brushes with a Multihelical Structure, Langmuir, 10.1021/acs.langmuir.7b04167, 34, 10, 3283-3288, 2018.03, It is well-known that a mixture of isotactic and syndiotactic polymethyl methacrylate (PMMA) forms a stereocomplex consisting of a multihelical structure in which an isotactic chain is surrounded by a syndiotactic chain. Here, we report the basic structure of the stereocomplex formed when the syndiotactic PMMA chains are tethered to a silicon substrate and form a high-density polymer brush. The influence of geometric confinement was investigated by preparing the high-density polymer brushes on a flat and spherical substrate. In both cases, mixing the untethered isotactic PMMA with the grafted syndiotactic PMMA led to the formation of a stereocomplex with a multihelical structure. Static contact angle measurements showed a hindered surface mobility at the outermost surface of the polymer brush, indicating that the stereocomplex forms a crystalline structure. A syndiotactic polymer brush with substituted fluoroalkyl groups was prepared to increase the contrast for grazing incidence wide-angle X-ray diffraction (GIWAXD) measurements. The GIWAXD results verified that the stereocomplex forms a crystalline structure oriented perpendicular to the substrate with a relatively low degree of orientation.. |
| 14. |
Yongjiao Sun, Koichi Suematsu, Ken Watanabe, Maiko Nishibori, Jie Hu, Wendong Zhang, Kengo Shimanoe, Determination of effective oxygen adsorption species for CO sensing based on electric properties of indium oxide, Journal of the Electrochemical Society, 10.1149/2.0591807jes, 165, 7, B275-B280, 2018.01, To understand the relationship between adsorbed oxygen on the surface of indium oxide (In
2
O
3
) and its CO-sensing property in wet and dry atmospheres, the oxygen adsorption properties and sensor response to CO were investigated. In
2
O
3
particles were prepared by a precipitation method and characterized using X-ray diffraction, scanning electron microscopy, and nitrogen absorption measurements. The O− and O
2−
adsorption equilibrium constants, K
1
and K
2
, respectively, were calculated from the relationship between the electrical resistance and the oxygen partial pressure (P
O2
) using a competitive adsorption model. It was found that the values of both K
1
and K
2
decreased with increasing humidity, indicating a reduction in the amount of oxygen adsorption on the In
2
O
3
surface in a wet atmosphere. The In
2
O
3
particles can detect CO at ppm level in dry and wet atmospheres, although they were greatly reduced in wet atmospheres. Moreover, we found that the sensor response to CO is closely related to the values of K
1
and K
2
.. |
| 15. |
Kazuhisa Yamasumi, Keiichi Nishimura, Yutaka Hisamune, Yusuke Nagae, Tomoki Uchiyama, Kazutaka Kamitani, Tomoyasu Hirai, Maiko Nishibori, Shigeki Mori, Satoru Karasawa, Tatsuhisa Kato, Ko Furukawa, Masatoshi Ishida, Hiroyuki Furuta, Bis-Copper(II)/π-Radical Multi-Heterospin System with Non-innocent Doubly N-Confused Dioxohexaphyrin(1.1.1.1.1.0) Ligand, Chemistry - A European Journal, 10.1002/chem.201704321, 23, 61, 15322-15326, 2017.11, A contracted doubly N-confused dioxohexaphyrin(1.1.1.1.1.0) complex consisting of two paramagnetic copper metals and open-shell π-radical ligand was synthesized as a new multi-heterospin motif. X-ray spectroscopy supported the divalent character of the inner copper centers, and electron paramagnetic resonance and magnetometric studies suggested the presence of unpaired d electrons strongly antiferromagnetically coupled with π-radicals delocalized on the macrocycle. The 25 π non-innocent dioxohexaphyrin ligand allowed the facile interconversion between antiaromatic 24 π and aromatic 26 π species, respectively, upon redox reactions.. |
| 16. |
Kengo Shimanoe, N. Ma, T. Oyama, Maiko Nishibori, Ken Watanabe, High performance of SnO2-based gas sensor by introducing perovskite-type oxides, Symposium on Chemical Sensors 12: Chemical and Biological Sensors and Analytical Systems - PRiME 2016/230th ECS Meeting
Chemical Sensors 12
Chemical and Biological Sensors and Analytical Systems, 10.1149/07516.0031ecst, 75, 31-37, 2017.11. |
| 17. |
Hongcheng Ruan, Maiko Nishibori, Tomoki Uchiyama, Kazutaka Kamitani, Kengo Shimanoe, Soot oxidation activity of Ag/HZSM-5 (Si/Al=40) catalyst, Evergreen, 4, 2-3, 7-11, 2017.09, Ag/HZSM-5 with Si/Al ratio of 40 was synthesized by the impregnation method. The catalyst materials were characterized by the X-ray diffraction and X-ray absorption spectroscopy by Ag-L3 edge and Ag-K edge. Three different chemical states of Ag (ZO-Ag+, O-Ag+ and metallic Ag, here Z represents Si or Al) in the catalyst. The soot oxidation performance was evaluated by the TG-DTA measurement and showed two combustion stages in tight contact mode which indicates the intrinsic soot oxidation activity. This is because that a lot of Ag ion-exchanged with H ions and existed in the pores of HZSM-5 as ZO-Ag+, which cannot work for soot oxidation. Additionally, this catalyst has a high thermal stability even after high temperature program at 800 °C.. |
| 18. |
Hongcheng Ruan, Maiko Nishibori, Tomoki Uchiyama, Kakeru Ninomiya, Kazutaka Kamitani, Kazuo Kato, Yuko Konishi, Alexander Haensch, Nicolae Barsan, Udo Weimar, Kengo Shimanoe, Soot oxidation performance with a HZSM-5 supported Ag nanoparticles catalyst and the characterization of Ag species, RSC Advances, 10.1039/c7ra06712g, 7, 69, 43789-43797, 2017.09. |
| 19. |
Hongcheng Ruan, Maiko Nishibori, Tomoki Uchiyama, Kakeru Ninomiya, Kazutaka Kamitani, Yuko Konishi, Kengo Shimanoe, Effect of thermal conductivity of catalytic materials on soot sensing performance based on a combustion-type sensor, Chemistry Letters, 10.1246/cl.170480, 46, 9, 1304-1307, 2017.09. |
| 20. |
Pallavi B. Mungse, Govindachetty Saravanan, Maiko Nishibori, Jan Subrt, Nitin K. Labhsetwar, Solvent-free, improved synthesis of pure bixbyite phase of iron and manganese mixed oxides as low-cost, potential oxygen carrier for chemical looping with oxygen uncoupling, Pure and Applied Chemistry, 10.1515/pac-2016-1127, 89, 4, 511-521, 2017.04, Chemical looping with oxygen uncoupling (CLOU) is the tendency of releasing gaseous oxygen of an oxygen carrier upon heating, which is the key property for the efficient and cleaner combustion of solid fuels for their wide exploitation for thermal power applications. The solvent-free, improved synthesis method was developed for the synthesis of pure bixbyite, FeMnO3 (Ia3-, a=b=c=0.94 nm) as a low-cost, oxygen carrier by exposing of the abundantly available precursors (Fe3O4 and MnO) under inert- or reduction- atmosphere followed by air at 900°C. The bixbyite FeMnO3 showed the enhanced, stable multi-cycle CLOU performance than that of the physical mixture and it is converted into FeMn2O4 after the complete exhaustion of reactive oxygen under CLOU conditions. FeMnO3 showed the uniform elemental distribution of Fe, Mn and O, which facilitate the regeneration in air upon heating for multi-cycle performance. 3.2 wt.% of reactive oxygen can be obtained compared to the mass of FeMnO3 which is almost equal to the theoretical value under CLOU conditions. The lattice of FeMnO3 is altered linearly above 100°C with the increase of temperature, however; without the decomposition of the bixbyite phase and it was reinstated virtually upon cooling in air.. |
| 21. |
Hongcheng Ruan, Maiko Nishibori, Tsutomu Itou, Yoshihiko Sadaoka, Yasutake Teraoka, Sensing of soot oxidation by using combustion-type sensor with Ag-supported catalyst, Sensors and Materials, 10.18494/SAM.2016.1283, 28, 11, 1219-1228, 2016.11. |
| 22. |
Tomoyasu Hirai, Y. Nagae, K. L. White, K. Kamitani, M. Kido, T. Uchiyama, Maiko Nishibori, Y. Konishi, K. Yokomachi, R. Sugimoto, K. Saigo, T. Ohishi, Yuji Higaki, Ken Kojio, Atsushi Takahara, Solvent free oxidative coupling polymerization of 3-hexylthiophene (3HT) in the presence of FeCl3 particles, RSC Advances, 10.1039/c6ra23178k, 6, 113, 111993-111996, 2016.11, A solvent free oxidative coupling reaction of 3-hexylthiophene (3HT) within a nanocavity is reported. It is found that 3HT can be encapsulated in nanocavities larger than 1 nm, which corresponds to the size of the molecule. In this case, the side reaction at the 4-position in 3HT is regulated.. |
| 23. |
Akane Doi, Maiko Nishibori, Kenji Obata, Takuya Suzuki, Kengo Shimanoe, Shigenori Matsushima, Micronization of MgFe2 O4 particles doped with Si, Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, 10.2109/jcersj2.16042, 124, 7, 777-780, 2016.07, The effect of Si addition was studied for the purpose of the improvement of microstructure of MgFe2O4 particles prepared from a malic acid complex. There were no traces of any impurity phase in Si-doped and pure MgFe2O4 powders both in XRD measurements. When Si atoms were doped to MgFe2O4 , crystallite growth of MgFe2O4 was remarkably suppressed, and the lattice volume increased up to 10 mol% Si monotonously. SEM observations revealed that MgFe2O4 powders show a granulation shape such as the aragonite and each particle tightly interconnected each other, whereas smaller particles compared with pure MgFe2O4 were observed for Si-doped MgFe2O4 . Also, it was found that the amount of mesopore increases by Si doping. Further, XPS and XAS measurements suggested that Si atoms exist in MgFe2O4 crystal.. |
| 24. |
Tomoki Uchiyama, Maiko Nishibori, Hisahiro Einaga, Yasutake Teraoka, Reduction process of Pd-containing La-Fe perovskite-type oxides by in-situ Dispersive X-ray absorption spectroscopy, Journal of Physics: Conference Series, 712, 012043, 2016.05. |
| 25. |
Tomoyasu Hirai, Sato Masanao, Kido Makoto, Nagae Yusuke, Yuji Higaki, Yasutake Teraoka, Maiko Nishibori, 神谷 和孝, Ken Kojio, Atsushi Takahara, X-Ray Absorption Fine Structure Study on the Role of Solvent on Polymerization of 3-Hexylthiophene with Solid FeCl3 Particles, JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 10.1002/pola.27720, 53, 18, 2075-2078, 2015.09. |
| 26. |
Tomoki Uchiyama, Reiko Karita, Maiko Nishibori, Hisahiro Einaga, Yasutake Teraoka, Preparation and characterization of Pd loaded Sr-deficient K2NiF4-type (La, Sr)2MnO4 catalysts for NO-CO reaction, Catal. Today, 251, 7-13, 2015.08. |
| 27. |
内山智貴, 西堀 麻衣子, 永長 久寛, 寺岡 靖剛, Formation of Tetravalent Fe Ions in LaFeO3 Perovskite Through Mechanochemical Modification by Ball Milling, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 10.1111/jace.13513, 98, 4, 1047-1051, 2015.04. |
| 28. |
Megarajan, Suresh Kumar, Rayalu, Sadhana, 西堀 麻衣子, Labhsetwar, Nitin, Improved catalytic activity of PrMO3 (M = Co and Fe) perovskites: synthesis of thermally stable nanoparticles by a novel hydrothermal method, NEW JOURNAL OF CHEMISTRY, 10.1039/c4nj01088d, 39, 3, 2342-2348, 2015.03. |
| 29. |
山口修平, 福良智弘, 瀧口 慶子, 藤田千春, 西堀 麻衣子, 寺岡 靖剛, 八尋秀則, Selective hydroxylation of cyclohexene over Fe-bipyridine complexes encapsulated into Y-type zeolite under environment-friendly conditions, CATALYSIS TODAY, 10.1016/j.cattod.2014.07.038, 242, 261-267, 2015.03. |
| 30. |
永井大輔, 西堀 麻衣子, 伊藤敏雄, 川部勤, 佐藤一雄, 申ウソク, Ppm level methane detection using micro-thermoelectric gas sensors with Pd/Al2O3 combustion catalyst films, SENSORS AND ACTUATORS B-CHEMICAL, 10.1016/j.snb.2014.09.059, 206, 488-494, 2015.01. |
| 31. |
Suresh Kumar Megarajan, Sadhana Rayalu, 西堀 麻衣子, 寺岡 靖剛, Nitin Labhsetwar, Effects of Surface and Bulk Silver on PrMnO3+delta Perovskite for CO and Soot Oxidation: Experimental Evidence for the Chemical State of Silver, ACS CATALYSIS, 10.1021/cs500880w, 5, 1, 301-309, 2015.01. |
| 32. |
Yuki Fujio, Chao-Nan Xu, 西堀 麻衣子, 寺岡 靖剛, 神谷 和孝, Nao Terasaki, Naohiro Ueno, Development of highly sensitive mechanoluminescent sensor aiming at small strain measurement, 2014.06. |
| 33. |
Mungse, Pallavi, Saravanan, Govindachetty, 内山智貴, 西堀 麻衣子, Yasutake Teraoka, Rayalu, Sadhana, Labhsetwar, Nitin, Copper manganese mixed oxides: CO2-selectivity, stable, and cyclic performance for chemical looping combustion of methane, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 10.1039/c4cp01747a, 16, 36, 19634-19642, 2014.05. |
| 34. |
Nagai, Daisuke, 西堀 麻衣子, Nakashima, Takaomi, Itoh, Toshio, Izu, Noriya, Shin, Woosuck, Thermoelectric gas sensor with CO combustion catalyst for ppm level carbon monoxide detection, SENSORS AND ACTUATORS B-CHEMICAL, 10.1016/j.snb.2013.03.061, 182, 789-794, 2013.06. |
| 35. |
Maiko Nishibori, Woosuck Shin, Noriya Izu, Toshio Itoh, Ichiro Matsubara, CO oxidation performance of Au/Co3O4 catalyst on the micro gas sensor device, Catalysis Today, 201, 85-91, 2013.03. |
| 36. |
Toshio Itoh, Ichiro Matsubara, Jun Tamaki, Woosuck Shin, Noriya Izu, Maiko Nishibori , Effects of noble metal addition on response of ceria thick film CO sensors, SENSORS AND ACTUATORS B-CHEMICAL, 10.1016/j.snb.2012.04.058, 171, 350-353, 2012.08. |
| 37. |
Toshio Itoh, Ichiro Matsubara, Jun Tamaki, Woosuck Shin, Noriya Izu, Maiko Nishibori, Effect of High-Humidity Aging on Performance of Tungsten Oxide-Type Aromatic Compound Sensors, Sensor and Materials, 2012.05. |
| 38. |
Woosuck Shin, Takaomi Nakashima, Maiko Nishibori, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Planar-type thermoelectric micro devices using ceramic catalytic combusto, Current Applied Physics, 11, S36-40, 2011.07. |
| 39. |
Woosuck Shin, Takaomi Nakashima, Maiko Nishibori, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Yoshihiko Nakagawa, Atsushi Yamamoto, Haruhiko Obara, Micro-generator using BiSbTe-Pt Thermopile and Pt-Al2O3 ceramic combustor, Journal of Electronic Materials, 40, 817-822, 2011.05. |
| 40. |
Woosuck Shin, Maiko Nishibori, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Kazutoshi Nose, Akihito Shimouchi, Monitoring Breath Hydrogen using Thermoelectric Sensor, Sensor Letters, 9, 684-687, 2011.04. |
| 41. |
Toshio Itoh, Yuko Taguchi, Noyira Izu, Ichiro Matsubara, Shyun-ichi Nakamura, Kengo Suzuki, Keisen Kanda, Woosuck Shin, Maiko Nishibori, Alternating Current Impedance Analysis of CeO2 Thick films as Odor Sensors, Sensor Letters, 9, 703-705, 2011.04. |
| 42. |
Maiko Nishibori, Woosock Shin, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Thermoelectric micro-multi-gas sensor for the detection of hydrogen, carbon monoxide and methane, Sensor Letters, 9, 773-777, 2011.04. |
| 43. |
Maiko Nishibori, Woosuck Shin, Noriya Izu, Toshio Itoh, Ichiro Matsubara, CO combustion catalyst for micro gas sensor application, Journal of Materials Science, 46, 1176-1183, 2011.03. |
| 44. |
Maiko Nishibori, Woosuck Shin, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Microheater Meander Configurations for Combustion Catalysts in Thermoelectric Gas Sensor, Sensor Letters, 8, 792-800, 2010.12. |
| 45. |
Toshio Itoh, Ichiro Matsubara, Masahiro Kakuzaki, Yu-ichi Sakai, Woosuck Shin, Noriya Izu, Maiko Nishibori, Effects of high-humidity aging on platinum, palladium, and gold loaded tin oxide-volatile organic compound sensors, Sensors, 10, 6513-6521, 2010.06. |
| 46. |
Noriya Izu, Woosuck Shin, Ichiro Matsubara, Toshio Itoh, Maiko Nishibori, Norimitsu Murayama, Pt catalytic effect of resistive oxygen sensor using Ce0.9Zr0.1O2 thick film in rich conditions, Journal of the Ceramic Society of Japan, 118, 3, 175-179, 2010.03. |
| 47. |
Noriya Izu, Woosuck Shin, Ichiro Matsubara, Toshio Itoh, Maiko Nishibori, Norimitsu Murayama, Pt catalytic effect of resistive oxygen sensor using Ce0.9Zr0.1O2 thick film in rich conditions, Journal of the Ceramic Society of Japan, 118, 3, 175-179, 2010.03. |
| 48. |
Toshio Itoh, Ichiro Matsubara, Woosuck Shin, Noriya Izu, Maiko Nishibori, XPS study of organic/MoO3 hybrid thin films for aldehyde gas sensors: correlation between average Mo valence and sensitivity, Journal of the Ceramic Society of Japan, 118, 3, 171-174, 2010.03. |
| 49. |
Noriya Izu, Sayaka Nishizaki, Woosuck Shin, Toshio Itoh, Maiko Nishibori, Ichiro Matsubara, Resistive oxygen sensor using ceria-zirconia sensor material and ceria-yttria temperature compensating material for lean-burn engine, Sensors, 9-11, 8884-8895, 2009.11. |
| 50. |
Toshio Itoh, Ichiro Matsubara, Masahiro Kakuzaki,Yu-ichi Sakai, Woosuck Shin, Noriya Izu, Maiko Nishibori, Gas-Sensing Properties of Tin Oxide-Based Volatile Organic Compound Sensors to Total Volatile Organic Compound Gases, Sensors and Materials, 21, 5, 251-258, 2009.08. |
| 51. |
Ayako Omura, Kyoko Sato, Nozomu Hamaya, Maiko Nishibori, Yasuo Ohishi, Structure of pressure-induced amorphous form of SnI4 at high pressure, Physical Review B, 80, 054201, 2009.08. |
| 52. |
Woosuck Shin, Masahiko Ishikawa, Maiko Nishibori, Toshio Itoh, Noriya Izu, Ichiro Matsubara, High-Temperature Measurement of Thermoelectric Thin Films, Materials Transactions, 50, 7, 1596-1602, 2009.07. |
| 53. |
Noriya Izu, Toshio Itoh, Maiko Nishibori, Woosuck Shin, Ichiro Matsubara, Physicochemical properties and microstructures of core-shell type cerium oxide/organic polymer nanospheres, Journal of the Ceramic Society of Japan, 117, 6, 773-776, 2009.06. |
| 54. |
Woosuck Shin, Maiko Nishibori, Lionel Houlet, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Fabrication of thermoelectric gas sensors on micro-hotplates, Sensors and Actuators B-Chemical, 139, 340-345, 2009.06. |
| 55. |
Noriya Izu, Inhwa Shin, Woosuck Shin, Toshio Itoh, Maiko Nishibori, Ichiro Matsubara, Preparation of core-shell type cerium oxide/polymer hybrid nanoparticles for ink-jet printing, Journal of the Ceramic Society of Japan, 117, 6, 769-772, 2009.06. |
| 56. |
Woosuck Shin, Maiko Nishibori, Masayoshi Ohashi, Toshio Itoh, Noriya Izu, Ichiro Matsubara, Ceramic catalyst combustors of Pt-loaded-alumina on micro devices, Journal of the Ceramic Society of Japan, 117, 659-665, 2009.05. |
| 57. |
Maiko Nishibori, Woosuck Shin, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Sensing performance of thermoelectric hydrogen sensor for breath hydrogen analysis, Sensors and Actuators B-Chemical, 137, 524-528, 2009.04. |
| 58. |
Noriya Izu, Sayaka Nishizaki, Toshio Itoh, Maiko Nishibori, Woosuck Shin, Ichiro Matsuba, Gas response, response time and selectivity of a resistive CO sensor based on two connected CeO2 thick films with various particle sizes, Sensors and Actuators B-Chemical, 136, 2, 364-370, 2009.03. |
| 59. |
Maiko Nishibori, Woosuck Shin, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Shoei Yasuda, Seiichi Ohtani, Robust hydrogen detection system with a thermoelectric hydrogen sensor for hydrogen station application, International Journal of Hydrogen Energy, 34, 6, 2834-2841, 2009.03. |
| 60. |
Toshio Itoh, Noriya Izu, Ichiro Matsubara, Woosuck Shin, Maiko Nishibori, 13C CP/MAS Study of Cross-linkage Poly(vinylpyrrolidone) on Surface of Cerium Oxide Nano particles, Chemistry Letters, 37, 11, 1116-1117, 2008.11. |
| 61. |
Toshio Itoh, Ichiro Matsubara, Woosuck Shin, Noriya Izu, Maiko Nishibori, Analytical Study of Resistance Drift Phenomena on (PANI)xMoO3 Hybrid Thin Films as Gas Sensors, Bulletin of the Chemical Society of Japan, 81, 10, 1331-1335, 2008.10. |
| 62. |
Toshio Itoh, Ichiro Matsubara, Woosuck Shin, Noriya Izu, Maiko Nishibori, Characterizations of Interlayer Organic-Inorganic Nanohybrid of Molybdenum Trioxide with Polyaniline and Poly(o-anisidine), Materials Chemistry and Physics, 110, 1, 115-119, 2008.07. |
| 63. |
Toshio Itoh, Jun-Zhong Wang, Ichiro Matsubara, Woosuck Shin, Noriya Izu, Maiko Nishibori, Norimitsu Murayama, VOCs sensing properties of layered organic-inorganic hybrid thin films: MoO3 with various interlayer organic components, Materials Letters, 62, 17-18, 3021-3023, 2008.06. |
| 64. |
Noriya Izu, Ichiro Matsubara, Toshio Itoh, Woosuck Shin, Maiko Nishibori, Controlled synthesis of mono dispersed cerium oxide nano particle sols applicable to preparing ordered self-assemblies, Bulletin of the Chemical Society of Japan, 81, 6, 761-766, 2008.06. |
| 65. |
Lionel Houlet, Woosuck Shin, Maiko Nishibori, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Electrode contact study for SiGe thin film operated at high temperature, Applied Surface Science, 254, 4999-5006, 2008.05. |
| 66. |
Maiko Nishibori, Woosuck Shin, Kazuki Tajima, Lionel Houlet, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Long-term stability of Pt/alumina catalyst combustors for micro gas sensor application, Journal of the European Ceramic Society, 28, 2183-2190, 2008.05. |
| 67. |
Toshio Itoh, Ichiro Matsubara, Woosuck Shin, Noriya Izu, Maiko Nishibori, Preparation of Layered Organic-Inorganic Nanohybrid Thin Films of Molybdenum Trioxide with Polyaniline Derivatives for Aldehydic Gases Sensors in Dozens of ppb Level, Sensors and Actuators B-Chemical, 128, 2, 512-520, 2008.01. |
| 68. |
Lionel Houlet, Woosuck Shin, Maiko Nishibori, Noriya Izu, Toshio Itoh, Ichiro Matsubara, Fabrication and performance of free-standing hydrogen gas sensors, Sensors and Actuators B-Chemical, 129, 1, 1-9, 2008.01. |
| 69. |
Toshio Itoh, Ichiro Matsubara, Woosuck Shin, Noriya Izu, Maiko Nishibori, Highly Aldehyde Gas-Sensing Responsiveness and Selectivity of Layered Organic-Guest/MoO3-Host Hybrid Sensor, Journal of the Ceramic Society of Japan, 115, 11, 724-744, 2007.11. |
| 70. |
Maiko Nishibori, Woosuck Shin, Lionel Houlet, Kazuki Tajima, Toshio Itoh, Noriya Izu, Ichiro Matsubara, Preparation of Micro-Thermoelectric Hydrogen Sensor Loading Two Kinds of Catalyst to Enhance Gas Selectivity, Journal of the Ceramic Society of Japan, 115, 11, 748-750, 2007.11. |
| 71. |
Maiko Nishibori, Woosuck Shin, Kazuki Tajima, Lionel Houlet, Noriya Izu, Toshio Itoh, Susumu Tsubota, Ichiro Matsubara, CO oxidation catalyst on the thermoelectric gas sensor, Journal of the Ceramic Society of Japan, 115, 1, 37-41, 2007.01. |
| 72. |
Woosuck Shin, Maiko Nishibori, Kazuki Tajima, Lionel Houlet, Yeongsoo Choi, Noriya Izu, Norimitsu Murayama, Ichiro Matsubara, Integration of Ceramic Catalyst on Micro-Thermoelectric Gas Sensor, Sensors and Actuators B-Chemical, 118, 283-291, 2006.10. |
| 73. |
Maiko Nishibori, Woosuck Shin, Lionel Houlet, Kazuki Tajima, Noriya Izu, Toshio Itoh, Norimitsu Murayama, Ichiro Matsubara, New Structural Design of Micro-thermoelectric Sensor for Wide range Hydrogen detection, Journal of the Ceramic Society of Japan, 114, 853-856, 2006.10. |
| 74. |
Maiko Nishibori, Woosuck Shin, Kazuki Tajima, Lionel Houlet, Noriya Izu, Ichiro Matsubara, Norimitsu Murayama, Catalyst combustors with B-doped SiGe/Au thermopile for micro power generation, Japanese Journal of Applied Physics, 45, 42, L1130-L1132, 2006.10. |
| 75. |
Kazuki Tajima, Woosuck Shin, Maiko Nishibori, Norimitsu Murayama, Toshio Itoh, Noriya Izu, Ichiro Matsubara, B- and P- Doped Si0.8Ge0.2 Thin Film deposited by Helicon Sputtering for the Micro-Thermoelectric Gas Sensor, Key Engineering, 320, 99-102, 2006.08. |
| 76. |
Woosuck Shin, Kazuki Tajima, Yeongsoo Choi, Maiko Nishibori, Noriya Izu, Ichiro Matsubara, Norimitsu Murayama, Micro Thermoelectric Device with Ceramic Combustor, Sensors and actuators A, 130, 411-418, 2006.08. |
| 77. |
Kazuki Tajima, Woosuck Shin, Maiko Nishibori, Toshio Itoh, Noriya Izu, Ichiro Matsubara, Pt loaded alumina ceramic catalysts for Micro Thermoelectric Hydrogen Sensors, Journal of the Ceramic Society of Japan, 114, 686-691, 2006.08. |
| 78. |
Naoya Sawaguchi, Maiko Nishibori, Kazuki Tajima, Woosuck Shin, Noriya Izu, Norimitsu Murayama, Ichiro Matsubara, Practical Test Methods for Hydrogen Gas Sensor Response Characterization, Electrochemistry, 74, 315-320, 2006.04. |
| 79. |
Tetsuo Irifune, Maiko Isshiki, Shizue Sakamot, Transmission electron microscope observation of the high-pressure form of magnesite retrieved from laser heated diamond anvil cell, Earth and Planetary Science Letters, 239, 98-105, 2005.10. |
| 80. |
Shigeaki Ono, Yasuo Ohishi, Maiko Isshiki, Tetsu Watanuki, In situ X-ray observations of phase assemblages in peridotite and basalt compositions at lower mantle conditions: Implications for density of subducted oceanic plate, Journal of Geophysical Research, Solid Earth, 110, B02208, 2005.02. |
| 81. |
Tatsuhiko Kawamoto, Kyoko Matsukage, Kenji Mibe, Maiko Isshiki, Koushi Nishimura, Naoki Ishimatsu, Shigeaki Ono, Mg/Si Ratios of Aqueous Fluids Coexisting with Forsterite and Enstatite Based on the Phase Relations in the Mg2SiO4-SiO2-H2O System, American Mineralogist, 2004.10. |
| 82. |
Motohiko Murakami, Kei Hirose, Shigeaki Ono, Taku Tsuchiya, Maiko Isshiki, Tetsu Watanuki, High Pressure and High Temperature Phase Transitions of FeO, Physics of the Earth and Planetary Interiors, 146, 273-282, 2004.08. |
| 83. |
Maiko Isshiki, Tetsuo Irifume, Kei Hirose, Shigeaki Ono, Yasuo Ohishi, Tetsu Watanuki, Eiji Nishibori, Masaki Takata, Makoto Sakata, Stability of magnesite and its high-pressure form in the lowermost mantle, nature, 427, 60-62, 2004.01. |
| 84. |
Kozaburo Tamura, Masanori Inui, Tetsuya Matsusaka, Daisuke Ishikawa, Kazi, MH., Hong, XG., Maiko Isshiki, Yasuo Ohish, Small angle X-ray scattering measurements for supercritical fluid metals using synchrotron radiation, Journal of Non-crystalline Solids, 2002.10. |
| 85. |
Shigeaki Ono, Kei Hirose, Maiko Isshiki, Kenji Mibe, Equation of state of hexagonal aluminous phase in basaltic composition to 63 GPa at 300 K, Physics and Chemistry of Minerals, 29, 527-531, 2002.09. |
| 86. |
Shigeaki Ono, Kei Hirose, Motohiko Murakami, Maiko Isshiki, Post-stishovite phase boundary in SiO2 determined by in situ x-ray observations, Earth and Planetary Science Letters, 197, 187-192, 2002.04. |
| 87. |
Shigeaki Ono, Kei Hirose, Norimasa Nishiyama, Maiko Isshiki, Phase boundary between Rutile-type and CaCl2-type germanium dioxide determined by in situ x-ray observations, American Mineralogist, 87, 99-102, 2002.01. |
| 88. |
Haruhiko Ohashi, Syunji Goto, Teru Kishimoto, Tomoko Murase, Maiko Isshiki, Yoshio Suzuki, Hiroaki Kimura, Kunikazu Takeshita, Tetsuya Ishikawa, Vacuum system of X-ray beamlines of SPring-8, Nuclear Instruments and Methods in Physics Research, Section A, 467, 801-804, 2001.07. |
| 89. |
Syunji Goto, Kunikazu Takeshita, Yoshio Suzuki, Haruhiko Ohashi, Yoshihiro Asano, Hiroaki Kimura, Tomohiro Matsushita, Naoto Yagi, Maiko Isshiki, Yuji Yamasaki, Yasuhiro Yoneda, Keiji Umetani, Tetsuya Ishikawa, Construction and commissioning of a 215-m-long beamline at SPring-8, Nuclear Instruments and Methods in Physics Research, Section A, 467, 682-685, 2001.07. |
| 90. |
Maiko Isshiki, Yasuo Ohishi, Syunji Goto, Kunikazu Takeshita, Tetsuya Ishikawa, High-energy x-ray diffraction beamline: BL04B2 at SPring-8, Nuclear Instruments and Methods in Physics Research, Section A, 467, 1, 663-666, 2001.07. |
| 91. |
Tetsu Watanuki, Osamu Shimomura, Takehiko Yagi, Tadashi Kondo, Maiko Nishibori, Construction of laser-heated diamond anvil cell system for in situ x-ray diffraction study at SPring-8, Advances in Laser Heated Diamond Cell Techniques
Review of Scientific Instruments, 10.1063/1.1343869, 72, 2, 1289-1292, 2001.02, A double-sided laser heated diamond anvil cell (DAC) system was constructed at a high brilliance, undulator beamline (BL10XU) at SPring-8 a third generation synchrotron radiation facility, for performing in situ angle-dispersive x-ray diffraction experiments under high temperature and high pressure. The design of this system puts emphasis on reliable data collection for the structural analysis. With this system, the adjustment of the optical systems for both x-ray and laser beams can be done easily, and high quality diffraction data can be obtained typically within several minutes. A system for temperature measurement of ten points in a sample area at the same time was also developed. The performance of the laser heated DAC system was tested by observing phase transitions of natural olivine.. |
| 92. |
Tomoji Ozeki, Katsuhiro Kusaka, Noritaka Honma, Yuji Nakamura, Setsuko Nakamura, Shunsuke Oike, Nobuhiro Yasuda, Hiroyuki Imura, Hidehiro Uekusa, Maiko Nishibori, Chuji Katayama, Yuji Ohashi, Crystal structure analysis of a hexatungstate by a high-energy X-ray diffraction experiment using an imaging plate Weissenberg camera at the BL04B2 beamline of SPring-81, Chemistry Letters, 10.1246/cl.2001.804, 8, 804-805, 2001.01, An imaging plate Weissenberg camera was installed in the BL04B2 beamline of SPring-8 aiming at automated crystal structure determinations of small molecules. Since this beamline is designed to provide X-rays with the energies higher than 37 keV (λ < 0.33 Å), this camera is advantageous in crystal structure analyses of heavily X-ray absorbing materials. The title crystal structure analysis led to precise positional parameters and well-behaved displacement parameters not only for heavy atoms but also for light atoms.. |
| 93. |
Tetsuo Irifune, Maiko Nishibori, Iron partitioning in a pyrolite mantle and the nature of the 410-km seismic discontinuity, Nature, 10.1038/33663, 392, 6677, 702-705, 1998.04, Pyrolite is a hypothetical mixture of distinct minerals which is widely believed to represent the composition of the Earth's mantle. The main pressure-induced phase transformations of the olivine component of pyrolite occur at about 13.5 GPa (α to β) and 24 GPa (γ to MgSiO3-rich perovskite + magnesiowustite), which are thought to be responsible for the seismic discontinuities at 410 and 660 km depths in the mantle. Recent seismological studies, however, have demonstrated that the 410-km seismic discontinuity is sharper in some areas than that expected from the α to β transformation in mantle olivine with a fixed composition. Moreover, some mineral physics studies suggest that the seismic velocity jump at the 410-km discontinuity is inconsistent with that associated with the α to β transformation in olivine. Here we present a phase equilibria study of a material having pyrolite composition at pressures of 6-16 GPa. We found that the iron content in olivine changes significantly with increasing pressure, as a result of the formation of a relatively iron-rich majorite phase at these pressures. This variation in iron content can overcome, or at least reduce, both of the above difficulties encountered with the pyrolite model of mantle composition, by showing that the component mineral systems cannot be treated as separate.. |
| 94. |
Tetsuo Irifune, Norimasa Nishiyama, Koji Kuroda, Toru Inoue, Maiko Nishibori, Wataru Utsumi, Ken Ichi Funakoshi, Satoru Urakawa, Takeyuki Uchida, Tomoo Katsura, Osamu Ohtaka, The postspinel phase boundary in Mg2SiO4 determined by in situ X-ray diffraction, Science, 10.1126/science.279.5357.1698, 279, 5357, 1698-1700, 1998.03, The phase boundary between spinel (γ phase) and MgSiO3 perovskite + MgO periclase in Mg2SiO4 was determined by in situ x-ray measurements by a combination of the synchrotron radiation source (SPring-8) and a large multianvil high-pressure apparatus. The boundary was determined at temperatures between 1400°to 1800°C, demonstrating that the postspinel phase boundary has a negative Clapeyron slope as estimated by quench experiments and thermodynamic analyses. The boundary was located at 21.1 (± 0.2) gigapascals, at 1600°C, which is ~2 gigapascals lower than earlier estimates based on other high-pressure studies.. |
| 95. |
Tetsuo Irifune, Norifumi Kubo, Maiko Nishibori, Yuji Yamasaki, Phase transformations in serpentine and transportation of water into the lower mantle, Geophysical Research Letters, 10.1029/97GL03572, 25, 2, 203-206, 1998.01, Phase transformations in serpentine, the major hydrous mineral in the upper part of the subducting slabs, have been studied at pressures to 26 GPa and at temperatures between 500 and 1400°C. While serpentine completely dehydrates at temperatures higher than 600-800°C and at pressures to 12 GPa, phase assemblages including some dense hydrous magnesium silicates (DHMS) such as phases A, E, superhydrous B and D were formed at higher pressures. Phase D was found to possess a stability field of particularly wide pressure and temperature regime, suggesting that this phase may play an important role in transportation of water into the lower mantle via subduction of cold slabs.. |
