Ibaraki University's
Professor Emeritus
(Graduate School of Science and Engineering)

Professor Emeritus

SAKUMA Takashi

  • Birth:1951

Other affiliation / position

  1. Frontier Research Center for Applied Atomic Sciences


  1. Faculty of Science, Ibaraki University (research associate) 1978/04-1985/03
  2. University of Colorado (research associate) 1982/10-1983/09
  3. Faculty of Science, Ibaraki University (associate professor) 1985/04-1995/03
  4. 山形大学大学院非常勤講師 1994/04-1995/03
  5. Faculty of Science, Ibaraki University (professor) 1995/04-2004/03
  6. 熊本大学非常勤講師 1999/04-2000/03
  7. 新潟大学大学院非常勤講師 1999/04-2000/03
  8. 東京工業大学非常勤講師 1999/04-2000/03
  9. 放送大学非常勤講師 2001/04-2002/03
  10. Graduate school of Science and Technology, Ibaraki University (Professor) 2004/04-Present
  11. Materials and Structures Laboratory, Tokyo Institute of Technology (visiting professor) 2006/04-2007/03
  12. 徳島大学大学院非常勤講師 2007/04-2008/03
  13. 放送大学非常勤講師 2007/04-2008/03

Academic background

  1. Ibaraki University Faculty of Science 物理学 1973 Graduated
  2. The University of Tokyo Graduate School, Division of Science 物理学 Doctor course 1978 Completed

Academic degrees

  1. 理学博士 The University of Tokyo

Current state of research and teaching activities

There has been increasing interest in a class of ionic solids that exhibit high ionic conductivity far below their melting points. Solid state devices of solid state ionics have been much in demand from various points of view. The studies of the microscopic structures and the dynamic properties of solid state ionics are important in understanding the mechanism of the conduction of ions. Our research is to extract the microscopic structure and the dynamic characteristic of solid state ionics by X-ray and neutron scattering measurements, and to solve the mechanism of conduction.

Research Areas

  1. Solid state physics

Research keywords

  1. superionic conductors, X-ray diffraction, neutron diffraction, diffuse scattering, thermal vibration of atoms, correlation effects

Subject of research

  1. Correlation effects between therm vibrations of atoms 1990-Present
  2. Structure of superionic conductors

Proposed theme of joint or funded research

  1. development of future cell Others


  1. DIFFUSE NEUTRON SCATTERING STUDY OF CORRELATION EFFECTS AMONG THERMAL DISPLACEMENTS OF ATOMS Takashi Sakuma, Xianglian, Hiroyuki Uehara and Saumya R. Mohapatra Nova Science Publishers 2011 978-1-61122-521-1
  2. ナノイオニクス -最新技術とその展望- 佐久間隆 シーエムシー出版 2008
  3. Structure and Diffuse Scattering of Superionic Conductor CuI T. Sakuma, Xianglian, K. Basar Nova Science publishers 2007
  4. Static and dynamic structure in solid state ionics T. Sakuma, K. Basar, T. Shimoyama, D. Hosaka, Xianglian, M. Arai Research Signpost 2006 単行本(Physics of Solid State Ionics)の編集
  5. Thermal vibration in crystalline and vitreous superionic conductors T. Sakuma, A. Thazin, M. Arai, H. Takahashi Transworld Research Network 2004


  1. Research paper (scientific journal) Joint New phase transition in superprotonic phase of inorganic solid acid Cs2(HSO4)(H2PO4) Haruyuki Takahashi, Yoshitaka Suzuki, Takashi Sakuma Solid State Ionics 285, 155-159 2016 10.1016/j.ssi.2015.09.027
  2. Research paper (scientific journal) Joint Estimation of Force Constants of Al from Diffuse Neutron Scattering Measurement Makhsun, Takuya Hashimoto, Takashi Sakuma, Haruyuki Takahashi, Osamu Kamishima, Naoki Igawa and Sergey A. Danilkin J. Phys. Soc. Jpn 83, 074602 2014 10.7566/JPSJ.83.074602
  3. Research paper (scientific journal) Joint Pressure dependence of crystal structure of Cu2O by TOF powder neutron diffraction Y. Ishikawa, T. Sakuma, H. Takahashi,S. A. Danilkin Solid State Ionics 262, 622-624 2014
  4. (MISC) Introduction and explanation (scientific journal) Joint 中性子散乱による二次電池材料中の構造乱れの研究 佐久間隆、檜山祐二 日本結晶学会誌 56, 104-108 2014/04 369-4585
  5. Research paper (scientific journal) Joint NEUTRON SCATTERING STUDY OF IONIC DIFFUSION IN Cu-Se SUPERIONIC COMPOUNDS Sergey A. Danilkin, Maxim Avdeev, Matthew Sale, Takashi Sakuma Solid State Ionics 225, 190-193 2012

Memberships of academic societies

  1. イオン輸送研究会
  2. 日本中性子科学会
  3. 固体イオニクス学会
  4. International Society for Solid-State Ionics
  5. 日本結晶学会