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Yashima Lab
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The lab uses X-rays and neutrons to reveal the crystal structures of ceramics.
AboutAbout the lab
Seeing directly inside crystals at high temperature.
The Yashima Lab studies inorganic materials such as ceramics, focusing on the relationship between their structure and properties.
Using diffraction experiments with X-rays and neutron beams, the lab investigates how atoms are arranged inside crystals.
By combining electric furnaces of its own design with synchrotron radiation and neutron beams, the lab reveals what happens at the high temperatures where materials actually operate.
Recently, building on the structure-property relationships it has uncovered, the lab has also been advancing the search for and development of new materials.
Key terms
- Crystal structure
- The regular arrangement of atoms in a solid. Even the same element, carbon, can become graphite or diamond depending on how its atoms are arranged.
- Ion conductor
- A material in which electricity flows because electrically charged atoms (ions) move through the solid.
- Neutron diffraction
- A method of determining atomic positions by directing a neutron beam at a crystal and measuring scattering by the atomic nuclei. It can also readily detect light elements that are hard to see with X-rays.
NewsLab news
Assistant Professor Saito receives the Best Poster Award at SSI-25
A student receives the Outstanding Presentation Award for Bachelor's Thesis Research
Assistant Professor Saito receives the Springer Thesis Award
A master's student receives the Outstanding Poster Award at the Spring Meeting of the Japan Institute of Metals and Materials
Press release on results improving proton conductivity at medium-to-low temperatures
ResearchResearch themes
Through crystal structure analysis using X-rays and neutron beams, the lab clarifies in detail the relationship between structure and properties in ceramic materials, with the aim of developing the next generation of ceramics. It focuses on diffraction experiments at the high temperatures where materials actually operate. Its main themes include elucidating the pathways along which ions move in ion conductors and bioceramics, and clarifying the properties of photocatalysts.
*Illustrative imageSearching for new ion conductors
By focusing on the size of atoms (ions) in its search for materials, the lab has discovered oxide-ion conductors with a structure type not seen before. It has also succeeded in making ions flow more easily through element substitution.
*Illustrative imageElucidating why ions flow so well
Using single-crystal neutron diffraction on an apatite-type oxide-ion conductor, the lab showed that ions flow so well because of the "destabilization of lattice oxygen," which differs from the accepted explanation.
*Illustrative imageMaking ion pathways visible
Examining the distribution of atomic nuclei with neutron diffraction reveals the path ions take through an ion conductor. The lab clarifies the ion pathways in ion conductors that operate at high temperatures.
*Illustrative imageProton movement in the materials of bones and teeth
Using high-temperature neutron diffraction on hydroxyapatite, the main component of bones and teeth, the lab clarified the diffusion pathways of protons (hydrogen ions), the chemical bonding, and the mechanism of phase transitions.
MembersFaculty
The members of the Yashima Lab consist of faculty, researchers, secretaries, and students in the doctoral, master's, and undergraduate programs.As of 2026
- ProfessorMasatomo YashimaPublications ↗
- Assistant ProfessorKei SaitoPublications ↗
- Project Assistant ProfessorShengqun SuPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “SPring- img pano” en:User:Artorius / CC BY-SA 3.0 (cropped)
- Searching for new ion conductors: “Dense pellet forming9” Dominik Bejma, Marta Kowalkińska / CC BY-SA 4.0 (cropped)
- Elucidating why ions flow so well: “Apatite crystal (GeoDIL number - 23)” Dexter Perkins / CC0 (cropped)
- Making ion pathways visible: “Solid oxide electrolyser cell prefab” EERE / Public domain (cropped)
- Proton movement in the materials of bones and teeth: “Micropear” Rob Pullar / CC BY 4.0 (cropped)
- Related lab (Uekusa Lab): “Sertraline-hydrochloride-form-I-xtal-3D-vdW” Ben Mills / Public domain (cropped)
- Related lab (Maeda Lab): “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
- Related lab (Taniguchi Lab): “Sinistral x dextral Limicolaria martensiana” Jxd / CC BY-SA 4.0 (cropped)
- Related lab (Kawano Lab): “Structure of NU-1000” Georgina P. Robertson, Sara Mosca, Celia Castillo-Blas, Florencia A. Son, Omar K. Farha, David A. Keen, Simone Anzellini, and Thomas D. Bennett / CC BY 4.0 (cropped)
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