Researcher Information

NAGAI Takaya


crystal chemistry of interesting minerals

Department of Earth and Planetary Sciences, Earth and Planetary System Science


crystal chemistry of titanate and silicate minerals with the perovskite structure
effects of H atoms on behaviors of hydrous minerals at high pressure and temperature

Fieldmineralogy, crystal chemistry, high pressure science
Keywordminerals, solid solution, crystal structire, perovskite structure, hydrous phases, diffraction, high pressure, high temperature

Introduction of Research

The most abundant mineral in the earth is considered to be the perovskite structured mineral "bridgmanite", which controls dynamics in the earth's interior. Bridgmanite is stable above 25 GPa and 1000 ℃, which are extremely high pressure and high temperature conditions. Thus we forecast chemical and/or physical behavior of bridgmanite by investigating analogous minerals, such as CaTiO3 perovskite, and then directly challenge to research bridgmanite and other silicate perovskites by mainly using high pressure apparatus and quantum beam diffraction technique.

Representative Achievements

Sugiura T., Arima H., Nagai T. et al.(2018) Structural variations accompanied by thermal expansion of diaspore: in-situ single-crystal and powder X-ray diffraction study, Physics & Chemistry of Minerals, 45, 1003-1010.
Li L., Nagai T. et al.(2015) Superior solid solubility of MnSiO3 in CaSiO3 perovskite, Physics & Chemistry of Minerals, 42, 123-129.
Li L., Nagai T. et al.(2014) Formation of a solid solution in the MgSiO3-MnSiO3 perovskite system, Physics & Chemistry of Minerals, 41, 431-437.
Nagai T. et al.(2005) A New Polymorph of FeAlO3 at High Pressure, Journal of Physical Chemistry B, 109, 18226-18229.
Nagai T. et al.(2003) Variation of hydrogen bonded O…O distances in goethite at high pressure, American Mineralogist, 88, 1423-1427.

Related industries

material science, environmental science
Academic degreeDSc
Academic background1988 BSc The University of Tokyo
1990 MSc The University of Tokyo
1992 Assistant Professor, Faculty of liberal arts, Osaka University
1994 Assistant Professor, Faculty of science, Osaka University
2003 Associate Professor, Faculty of science, Hokkaido University
Affiliated academic societyJapan Association of Mineralogical Sciences, The Japan Society of High Pressure Science and Technology, American MIneralogist
Room addressFaculty of Science Building 6 08-05