Structure science group

The Structure Science Group is investigating the atomic arrangements of materials using the wave characteristic of neutrons to understand their physical properties and materials functions. For this purpose, we have developed the world’s highest-resolution neutron diffractometer. We also developed a dedicated neutron instrument for the study of structural changes of electrodes in rechargeable batteries during charging/discharging reaction.

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Experience the fun of structure science research

Solid-state materials are classified into ‘crystal’ with high regularity and ‘amorphous/glass’ with low regularity. The differences in the arrangement of atoms and ions are what give solid-state materials their wide range of functions such as catalysts that facilitate chemical reactions, magnetic substances such as high-capacity storage media (hard disks), ionic conductors that are applied to gas sensors and storage batteries, thermoelectric materials, and superconductors. Researchers worldwide are creating materials with certain properties by combining atoms and ions, and they are trying to understand the theory behind why those properties emerge.

Our group is studying the structures and properties of substances and their relationships with functions of those substances by using two different neutron diffraction devices to analyze the arrangement of atoms and ions, an important aspect in materials research and structural property research. By using neutrons as a probe, and X-rays, synchrotron radiation, NMR, and RAMAN as needed, we can find how to express the functions of a material.

試料合成もします。 X線も使います。

Accurate structural analysis

The arrangement of atoms is studied with the highest accuracy by using the scattering and interference of neutrons with a wavelength equal to the distance between the atoms. The neutron diffractometer, SuperHRPD, which has the highest resolution of any ones in the world, can measure a tiny structural change that cannot be detected by conventional instruments.

精密構造解析
On June 21, 2008, we achieved the world’s greatest resolution in a diffraction experiment using silicon. The figure above compares our data with that obtained by Sirius, which was a world-leading diffractometer (operated until March 2006) at the High Energy Accelerator Research Organization. The sharper the peak, the higher the resolution. The resolution of the SuperHRPD is three times better than that of Sirius, the Bragg diffraction profile does not have a large tail and is symmetric, and the 1/10 width is improved more than ten times.
SuperHRPDの外観 SuperHRPD の外観図
Outline drawing and appearance of SuperHRPD

Research on storage batteries

While X-rays are scattered by electrons, neutrons are scattered by the nucleus of the atom. As a result, a small change in a material such as lithium, which is a light element, can be detected. In addition, the structural information of a particular part can be obtained by using the difference in the scattering power of isotopes. We are developing a neutron diffractometer called SPICA, under the auspices of the “Research & Development Initiative for Scientific Innovation of New Generation Batteries (RISING)” at the New Energy and Industrial Technology Development Organization (NEDO), and we are analyzing the change in the atomic arrangement of lithium and other atoms in charge and discharge reactions at the atomic level.

SPICAの外観図 SPICAの外観図
Outline drawing and appearance of SPICA
充電や放電に伴うリチウムイオン二次電池の電極材料の構造変化 充電や放電に伴うリチウムイオン二次電池の電極材料の構造変化
Structural change of electrode materials for lithium ion secondary batteries during charge and discharge. We captured structural change of the materials in the cathode and anode during charge and discharge, by real-time measurement. (層状岩塩型正極 003面: Layered rock salt-type cathode the 003 plane, 炭素負極 002面: Carbon anode the 002 plane, 放電: Discharge, 充電: Charge)

Development of a structural analysis method and Z-Code

We are researching a new structural analysis method to be used to conduct cutting-edge research in materials structure science with neutron diffractometers at J-PARC. In addition, we are developing Z-Code, a suite of software for the new method.

Download the Z-Rietveld GUI ver.
Download the Conograph GUI ver

Z-Rietveld のGUI
Z-Rietveld のGUI(Grafical user interface)

To students who are considering Sokendai (the Graduate University for Advanced Studies)

One positive aspect for graduate students in the Department of Materials Structure Science in the School of High Energy Accelerator Science at Sokendai (the Graduate University for Advanced Studies) is that they have access to the world’s most state-of-the-art probes (neutrons, muons, synchrotron radiation, and positrons) while at the same time receiving thorough instruction in the classroom. All graduate students will have many opportunities to give presentations at domestic and international academic meetings and travel overseas to improve their skills and gain various experiences. In addition, the university promotes interaction with domestic and foreign researchers and students. The graduate student can get support from a research assistant (RA) system, a scholarship system, and a tuition waiver. Our group is composed of people with degrees in physics, engineering, chemistry, and mathematics and we are looking for students who are eager to conduct new research in these fields. All the graduates from our group find employment at universities and research institutes after graduation.

Members

Name Positions Field
KAMIYAMA, Takashi Professor Group Leader、Crystallography, Physics
YONEYAMA, Masao Assoc. Professor In charge of SPICA、Crystallography, Chemistry
TORII, Shuki  Engineer, Reseacher In charge of SuperHRPD, Crystallography, Materials Science
TOMIYASU, Ryoko Assistant Professor software development, Crystallography, Mathematics
ISHIKAWA, Yoshihisa  Researcher Crystallography, Physics
LEE, Sanghyun Reseacher Crystallography, Physics
ASANO, Hajime Reseacher Crystallography, Materials Science
MIAO, Ping Postdoctoral reseacher Crystallography, Physics
ANMA Mutsuo Secretary  
HORIE, Mari Secretary  
ADIPRANOTO, Dyah S. Visiting Postdoctoral reseacher
(Kyoto Univ.)
Crystallography, Materials Science
MUROYA, Koji Engineer (NAT)  
SHIMIZU, Katsumi Engineer (NAT)  
SHIOYA, Masahiro Engineer (BBT)  
MANAKA, Yusuke Engineer (BBT)  
NANBA, Kaoru Reseacher (WDB)  
ISHIGAKI, Tohru Visiting Professor (Ibaraki Univ.) In charge of iMATERIA

         

[Links]

2012.09.07 IMSSトピック 蓄電池解析専用の中性子ビームラインSPICA完成
2012.02.28 IMSSトピック 新設ビームラインSPICAに中性子ビームを導入
2011.09.29 KEKハイライト 全固体型リチウム電池を目指して
2010.02.23 Feature Story A high resolution, high intensity neutron diffractometer
2008.07.24 NEWS@KEK 世界最高性能の中性子回折
2008.07.17 プレスリリース J-PARCの中性子回折実験装置が世界最高の分解能を達成
キッズサイエンティスト 中性子回折法による新型電池の研究