Kyushu University Academic Staff Educational and Research Activities Database
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Sato Yukio Last modified date:2022.11.08

Associate Professor / Material process engineering
Department of Materials Science and Engineering
Faculty of Engineering


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Homepage
https://kyushu-u.pure.elsevier.com/en/persons/yukio-sato
 Reseacher Profiling Tool Kyushu University Pure
http://zaiko13.zaiko.kyushu-u.ac.jp/
Phone
092-802-2971
Fax
092-802-2979
Academic Degree
Ph.D. (Science)
Field of Specialization
Material Science
Outline Activities
Study on microscopic origin of material properties via electron microscopy. Educational and social activities on materials science and engineering and natural science
Research
Research Interests
  • Interface structure and electrical property of semiconductor ceramics
    Micro-/Nano-scale structure of ferroelectrics
    Microstructure analysis of solid state materials
    keyword : Grain Boundary/Interface, Ferroelectrics, Semiconducting ceramics, Electron microscopy
    2014.04~2025.04.
Current and Past Project
  • In the present research, we use transmission electron microscopy to understand the response of domain structure and atomic arrangement in ferroelectric material by applying external electric field.
  • Microstructure of various ceramic materials are analyzed.
  • In this research project, we use first-principles calculation to explore the future transparent electrodes.
    This project is carried out as a part of Global Science Campus project of Kyushu University.
  • Current-voltage characteristic and microstructure, in particular, grain-boundary structure, which is used for varistor, is investigated.
Academic Activities
Papers
1. Yukio Sato, Ryuki Miyauchi, Mai Aoki, Syota Fujinaka, Ryo Teranishi, Kenji Kaneko, Large Electric-Field-Induced Strain Close to the Surface in Barium Titanate Studied by Atomic-Scale In Situ Electron Microscopy, PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS, 10.1002/pssr.201900488, 14, 1, 2020.01, Measuring the lattice parameters of crystalline materials under an electric field at the nanoscale improves the understanding of how electronics operate. Herein, atomic-scale in situ electron microscopy is used to measure the lattice parameters near the surface of barium titanate under an electric field, which is varied to understand how it changes the lattice parameters. Applying an electric field along the a axis does not cause domain switching. Instead, as the electric field increases, so as well does the c-axis lattice parameter (c), whereas the a-axis lattice parameter (a) remains nearly constant. The c value increases as much as 4.5 - 7.0 pm at +/- 13.8 kV cm(-1), which is beyond the measurement precision. The increases are localized near the surface and the c value recovers slowly, which suggests that the observed phenomena are related to surface effects and slow processes. These results cannot be explained by electrostrain, even when considering additional effects such as mechanical constraint, inclination of electric field, and surface and size effects. Instead, the results are explained using a combination of Joule heating, vacancy introduction, and surface effects..
Presentations
1. Yukio Sato, In Situ and Atomic-Scale Electron Microscopy Characterization of Relaxor Ferroelectrics, Materials Research Society 2022 Spring Meeting, 2022.05.
2. Yukio Sato, Atomic scale and in-situ electron microscopic analysis of ferroelectrics, 12th Pacific Rim Conference on Ceramic and Glass Technology including Glass & Optical Materials Division Meeting (Pacrim12), 2017.05.
3. Yukio Sato, Nanoscopic study on domain structure in morphotropic phase boundary Pb(Mg1/3Nb2/3)O3 – PbTiO3, International Conference on Technologically Advanced Materials & Asian Meeting of Ferroelectricity (ICTAM-AMF10), 2016.11.
4. Yukio Sato, Electron microscopic study on dynamics of nanoscale ferroelectric domains in Pb(Mg1/3Nb2/3)O3 – PbTiO3, The International Chemical Congress of Pacific Basin Societies (Pacifichem) 2015, 2015.12.
5. Yukio Sato, Transmission electron microscopic study on functional ceramics, International Symposium in Korean Microscopy Society Meeting, 2015.11.
6. Yukio Sato, Nano-scale and atomic-scale characterization of electroceramics, IUMRS-ICAM (International Union of Materials Research Societies, International Conference of Advanced Materials) 2015, 2015.10.
7. Yukio Sato, Electron microscopic study on origin of function in electroceramics, International Conference on Electron Microscopy and XXXVI Annual Meeting of the Electron Microscope Society of India (EMSI), 2015.07.
8. Yukio Sato, Ferroelectric nanodomain dynamics in morphotropic phase boundary piezoelectrics studied via in-situ transmission electron microscopy, EMN ceramic meeting, 2015.01.
9. Y. Sato,, Transmission electron microscopy study on nanodomain and its dynamics in morphotropic phase boundary Pb(Mg1/3Nb2/3)O3–PbTiO3, The 15th IUMRS-ICA (International Union of Materials Research Societies, International Conference in Asia), 2014.08.
Membership in Academic Society
  • The American Ceramic Society
  • The Dielectric Society of Japan
  • The American Ceramic Society
  • The Japan Society of Applied Physics
  • The Japanse Society of Microscopy
  • The Physical Society of Japan
  • Japan Institute of Metal
  • The Ceramic Society of Japan
Awards
  • 第29回セラミックスに関する顕微鏡写真展優秀賞
  • Award for Encouragement of Research of Materials Science
  • Graduate student gold award
  • 2nd place winner in a TEM class, Ceramographic Exhibition
  • Ross Coffin Purdy Award
  • 第33回(2011年度)応用物理学会論文賞
  • Award for Encouragement of Research in Thin Films
  • Shinposho Award, The Ceramic Society of Japan
  • 2014 JCS-JAPAN paper award
  • Contribution Award
Educational
Other Educational Activities
  • 2020.04.