Department of Physics, School of Science and Technology / Graduate School of Science and Technology, Meiji University: Earth and Planetary Interior Physics Laboratory (Sinmyo Laboratory)

A paper has been accepted and published in an international scientific journal.

Sinmyo R., Kawaguchi SI., Sato R., Otsuru K., Kawai K., Sakuma H., Suehara S., Ishii T., Maitani S. (2026) Cold SiO₂-rich slabs reaching the CMB revealed by the seifertite phase boundary. Scientific Reports.

https://doi.org/10.1038/s41598-026-54731-6

Press release: Discovery of seafloor rocks subducted deep into Earth’s interior

Press release articles:

Meiji University
SPring-8
Okayama University
The University of Tokyo

Laboratory members participated in the JpGU-AGU Joint Meeting 2026, where Ms. Shiogama gave a presentation.

Mana Shiogama, Ryosuke Sinmyo, Ken Niwa, Ai Ichinohe, Naohisa Hirao, Hirokazu Kadobayashi, “Diamond anvil cell experiments toward determining the maximum nitrogen solubility in magnesiowüstite”

https://www.jpgu.org/meeting_j2026/

In academic year 2025, one B4 student, two M2 students, and one D3 student graduated or completed their programs. Mr. Ogawa and Mr. Kobayashi received Master of Science degrees, and Dr. Maitani received a Doctor of Science degree. Congratulations to all graduates.

Photos after the degree conferment ceremony

Laboratory member Mr. Kobayashi participated in AGU 2025 and gave the following presentation.

Kenta Kobayashi, Ryosuke Sinmyo, Takayuki Ishii, Shuhou Maitani, “The stabilities of SiC polytypes at high pressure and temperature: Implications for the interior of the carbon-rich planets”

https://www.agu.org/annual-meeting

A paper has been accepted and published in a Japanese scientific journal.

新名良介, 米谷珠萌 (2025) 高圧力下で安定な酸化鉄の性質と地球惑星科学的意義. Review of High Pressure Science and Technology, 35(3), 127–134.

https://doi.org/10.4131/jshpreview.35.127

Laboratory members participated in JpGU 2025, where Dr. Maitani, Mr. Kobayashi, and Dr. Sinmyo gave presentations.

Shuhou Maitani, Ryosuke Sinmyo, Hikaru Higuchi, Tomoko Ikeda-Fukazawa, Saori Kawaguchi-Imada, “Compressibility of single crystal zircon up to 19 GPa: implication to the partitioning coefficient of trace elements”

Kenta Kobayashi, Ryosuke Sinmyo, Takayuki Ishii, Shuhou Maitani, “The stabilities of SiC polytypes at high pressure and temperature”

Ryosuke Sinmyo, Saori Kawaguchi-Imada, Rei Sato, Keisuke Otsuru, Kenji Kawai, Hiroshi Sakuma, Shigeru Suehara, Takayuki Ishii, Shuhou Maitani, “Cold SiO₂-rich slabs reaching the CMB revealed by the seifertite phase boundary”

https://www.jpgu.org/meeting_j2025/

Dr. Maitani’s paper has been accepted and published in an international scientific journal.

Maitani S., Sinmyo R., Higuchi H., Ikeda-Fukazawa T., Kawaguchi-Imada S. (2025) Compressibility of single-crystal zircon up to 19 GPa: implications for the partitioning coefficient of trace elements. European Journal of Mineralogy, 37, 257–267.

https://ejm.copernicus.org/articles/37/257/2025/

In academic year 2024, four B4 students and two M2 students graduated. Congratulations to all graduates.

Photos after the ceremony and at the appreciation party

After the degree conferment ceremony, a department-wide appreciation party was held, and the graduates presented slippers to the laboratory.

An article introducing the laboratory, written by Dr. Maitani, was published in the journal of the Japan Society of High Pressure Science and Technology.

Review of High Pressure Science and Technology, 34(3), 143–144 (2024)

https://doi.org/10.4131/jshpreview.34.143

Dr. Maitani’s paper has been accepted and published in an international scientific journal.

Maitani S., Sinmyo R., Ishii T., Yoza K. (2024) Inert structural transition in 4H and 6H SiC at high pressure and temperature: a Raman spectroscopy study. Journal of Physics Communications, 8, 065001.

https://iopscience.iop.org/article/10.1088/2399-6528/ad5410

Laboratory members participated in JpGU 2024, where Dr. Maitani and Mr. Kobayashi gave two oral presentations.

Shuhou Maitani, Yuto Kawai, Ryosuke Sinmyo, Saori Kawaguchi, Taiki Suzuki, Yoko Kebukawa, Kousuke Shimizu, Takashi Tominaga, Kensei Kobayashi, “The survival of organic matter in large impacts; approaches from sub-second ultra-high temperature and pressure experiments”

Kenta Kobayashi, Ryosuke Sinmyo, Takayuki Ishii, Shuhou Maitani, “The stabilities of SiC polytypes at high pressure and temperature”

https://www.jpgu.org/meeting_j2024/

In academic year 2023, five B4 students graduated.

Photos after the ceremony and at the appreciation party

After the degree conferment ceremony, a department-wide appreciation party was held, and the graduates presented cushions to the laboratory.

Faculty members and students from a university in Sri Lanka visited our laboratory.

Laboratory visit

In academic year 2022, six B4 students and three M2 students graduated.

Photos after the ceremony and at the appreciation party

After the degree conferment ceremony, a department-wide appreciation party was held, and the graduates presented a coffee maker and mugs to the laboratory.

The laboratory held a farewell party. A takoyaki grill was donated to the laboratory, and it may become a regular feature at future gatherings.

Takoyaki