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Research Interests

Development of high-pressure techniques

High-pressure generation techniques using a multi-anvil press

  1. Ishii et al. Rev. Sci. Instrum. (2016): 43 GPa at 300 K and 45 GPa at 2000 K using tapered WC anvils

  2. Ishii et al. High Press. Res. (2017): 64 GPa at 300 K and 48 GPa at 2000 K using tapered binder-less ultrahard WC anvils.

  3. Ishii et al. Engineering (2019): Review paper about techniques in Ishii et al. (2016, 2017). DIA-type guide block was renamed as Osugi-type guide block.

  4. Xie, Chanyshev, Ishii et al. Rev. Sci. Instrum. (2021): 50 GPa and 3300 K using sintered diamond anvils and boron-doped diamond heater

  5. Ishii et al. Earth Planet. Sci. Lett. (2022): 52 GPa at 2000 K and its application to basalt phase relations using ultrahard WC anvils

In-situ X-ray diffraction in multi-anvil press​

  1. Ishii et al. Sci. rep. (2018), Nat. Geosci. (2019): Pressure precision of 0.05 GPa was achieved up to 30 GPa and its applications to Mg2SiO4-Fe2SiO4 post-spinel phase relations.

  2. Chanyshev, Ishii et al. Nature (2022): Development of a novel method to determine a phase boundary strictly based on the definition of phase equilibrium and its application to Mg2SiO4 post-spinel transition and akimotoite-bridgmanite transition phase boundaries.

Multi-sample chamber method in multi-anvil press​

  1. Ishii et al. Earth Planet. Sci. Lett.  (2011): Simultaneous determination of bridgmanite formation reaction in pyrolite, Mg2SiO4 and MgSiO3 in a Re multi-hole capsule.

  2. Ishii et al. Earth Planet. Sci. Lett. (2012): Precise determination of phase relations of continental crust material by putting a calibrant in a Re multi-hole capsule.

  3. Ishii et al. Am. Mineral. (2014, 2015): Comparison of phase relations in MgCr2O4 and FeCr2O4 using a Re multi-hole capsule.

  4. Ishii et al. Phys. Earth Planet. Inter. (2018), J. Geophys. Res. (2019): Comparison of phase relations of pyrolite, basalt, and harzburgite using a Re multi-hole capsule.

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Phase relations of mantle rocks and minerals

Mantle rocks

  1. Ishii et al. Earth Planet. Sci. Lett. (2011): Pyrolite up to 28 GPa and 1800°C by quench method

  2. Ishii et al. Earth Planet. Sci. Lett. (2012): Continental crust material up to 28 GPa and 1800°C by quench method

  3. Ishii et al. Phys. Earth Planet. Inter. (2018): Pyrolite up to 28 GPa and 2200°C by quench method

  4. Ishii et al. J. Geophys. Res. (2019): Basalt and harzburgite up to 28 GPa and 2200°C by quench method

  5. Ishii et al. Earth Planet. Sci. Lett. (2022): Basalt up to 52 GPa at 2000 K by quench method

Mantle minerals

  1. Ishii et al. Earth Planet. Sci. Lett. (2011): Mg2SiO4 and MgSiO3 by quench method up to 28 GPa and 1800°C by quench method

  2. Akaogi, Horiuchi, Ishii et al. Pys. Chem. Miner. (2012): TiO2-ZrO2 system up to 12 GPa and 1800°C by quench method

  3. Ishii et al. Am. Mineral. (2014): FeCr2O4 up to 28 GPa and 1600°C by quench method

  4. Ishii et al. Am. Mineral. (2015): MgCr2O4 up to 28 GPa and 1600°C by quench method

  5. Liu, Nishi, Ishii et al. J. Geophys. Res. (2017): MgSiO3-Al2O3 up to 52 GPa and 2300 K by quench method and in-situ X-ray observation

  6. Liu, Ishii, Katsura Geochem. Persp. Lett. (2017): MgSiO3-MgAlO2.5 up to 40 GPa at 2000 K by quench method

  7. Akaogi, Abe, Yusa, Ishii et al. Phys. Chem. Miner. (2017): FeTiO3 up to 35 GPa and 1600°C by quench method

  8. Akaogi, Ishii et al. Am. Mineral. (2018): Mg2SiO4-MgCr2O4 up to 28 GPa at 1600°C by quench method

  9. Ishii et al. Sci. rep. (2018): The post-spinel transition in Mg2SiO4 at 1700 K by in situ X-ray observation

  10. Ishii et al.  Nat. Geosci. (2019): The post-spinel transition in Mg2SiO4-Fe2SiO4 at 1700 K by in situ X-ray observation

  11. Hirosaka, Sinmyo, Hirose, Ishii et al. Am. Mineral. (2019): Fe5O6 and Fe4O5 up to 61 GPa and 2720 K by laser-heated diamond anvil cell

  12. Ishii et al. Geophys. Res. Lett. (2020): MgFe2O4 up to 25 GPa and 1200°C by quench method

  13. Liu, McCammon, Wang, Dubrovinsky, Ishii et al. J. Geophys. Res. (2020): MgO-SiO2-Al2O3-Fe-O2: 27 GPa at 2000 K by quench method

  14. Ishii et al. Am. Mineral. (2021): MgAl2O4 at 27 GPa and 2500°C by quench method

  15. Ishii et al. Earth Planet. Sci. Lett. (2022): MgSiO3-Al(OH)3 up to 28 GPa and 1600°C by quench method

  16. Chanyshev, Bondar, Fei, Purevjav, Ishii et al. Contrib. MIneral. Petrol. (2021): Mg2SiO4-Fe2SiO4 up to 11 GPa at 1740 K by in situ X-ray observation

  17. Chanyshev, Ishii et al. Nature (2022): Bridgmanite formation reaction boundaries in Mg2SiO4 and MgSiO3 by in situ X-ray observation

Crystal chemistry of mantle related minerals

  1. Ishii et al. Am. Mineral. (2014): Rietveld analyses novel phases of modified CaFe2O4-type FeCr2O4 and modified ludwigite-type Fe2Cr2O5 and CaTi2O4-type FeCr2O4.

  2. Ishii et al. Am. Mineral. (2015): Rietveld analyses of CaTi2O4-type MgCr2O4 and modified ludwigite-type Mg2Cr2O5.

  3. Ishii et al. Am. Mineral. (2017): Single crystal X-ray diffraction analysis of modified ludwigite-type Mg2Cr2O5.

  4. Ishii et al. Am. Mineral. (2017): Rietveld analysis of Lithium niobate-type Mg3Al2Si3O12.

  5. Ishii et al. Geophys Res. Lett. (2020): Rietveld analysis of a novel post-spinel structured MgFe2O4.

  6. Ishii et al. Am. Mineral. (2021): Single crystal structure analyses of CaTi2O4-type and novel structured MgAl2O4.

Role of water in the mantle (water solubility and element partitioning)

  1. Ishii et al. Nat. Geosci. (2021): Kinetically dry forsterite and wadsleyite whencoexisting with hydrous phase A.

  2. Ishii et al. Earth Planet. Sci. Lett. (2022): Alumina depletion in bridgmanite and dry bridgmanite when coexisting with hydrous phase δ and D.

Elastic properties of mantle minerals

  1. Ishii et al. Am. Mineral. (2014): CaFe2O4-type FeCr2O4 compressibility at room T

  2. Ishii et al. Geophys. Res. Lett. (2020): Compressibility of a novel post-spinel structured MgFe2O4 at room T

Materials science

  1. Cheng, Ishii et al. Phys. Rev. B (2013): Synthesis of new compound of cubic perovskite-type BaIrO3

  2. Ishii et al. Inorg. Chem. (2018): Syntheses of new compounds of CaTi2O4-type MgV2O4 and FeV2O4 and CaFe2O4-type MnCr2O4

  3. Tang, Yuan, Cheng, Fei, Liu, Liang, Zeng, Ishii et al. Nature (2021): Synthesis of paracrystalline diamond.

Research Interests: 研究
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