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  1. No Access

    Chapter

    The Use of Sintered Diamond Anvils in the MA8 Type High-pressure Apparatus

    A new multi-anvil type high-presure apparatus has been developed using sintered diamond anvils to generate pressures over 30 GPa and temperatures up to about 2000°C. A maximum sample volume of about 1 mm3 is avai...

    Tadashi Kondo, Hiroshi Sawamoto… in Experimental Techniques in Mineral and Roc… (1994)

  2. No Access

    Article

    The use of sintered diamond anvils in the MA8 type high-pressure apparatus

    A new multi-anvil type high-presure apparatus has been developed using sintered diamond anvils to generate pressures over 30 GPa and temperatures up to about 2000°C. A maximum sample volume of about 1 mm3 is avai...

    Tadashi Kondo, Hiroshi Sawamoto, Akira Yoneda, Manabu Kato… in pure and applied geophysics (1993)

  3. No Access

    Article

    β(Mg0.9, Fe0.1)2SiO4: Single crystal structure, cation distribution, and properties of coordination polyhedra

    The synthesis boundaries of the phase transformation; α+β→β→β+γ→γ in (Mg0.9, Fe0.1)SiO4, have been clarified at temperatures to 2000° C and pressures up to 20 GPa in order to synthesize single crystals of high qu...

    Hiroshi Sawamoto, Hiroyuki Horiuchi in Physics and Chemistry of Minerals (1990)

  4. No Access

    Article

    Pressure and temperature dependence of cation distribution in Mg-Mn olivine

    Synthetic (Mg0.51, Mn0.49)2SiO4 olivine samples are heat-treated at three different pressures; 0, 8 and 12 GPa, all at the same temperature (∼500° C). X-ray structure analyses on these single crystals are made in...

    Tadashi Akamatsu, Kiyoshi Fu**o, Mineo Kumazawa… in Physics and Chemistry of Minerals (1988)

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    Article

    Antiferromagnetic transition of fayalite under high pressure studied by Mössbauer spectroscopy

    Néel temperature (Tm N of α-Fe2SiO4 (fayalite) was measured as a function of pressure by means of Mössbauer spectroscopy in the pressure range 0–16 Gpa. High pressure was genera...

    Mitsuhiko Hayashi, Ichiro Tamura, Osamu Shimomura… in Physics and Chemistry of Minerals (1987)

  6. No Access

    Article

    Melting of a model chondritic mantle to 20 GPa

    Calculations of the sthermal evolution of the Earth during accretion suggest that the outer layer may once have been molten, perhaps to a depth of 1,000 km or more1,2. If such global melting did occur, fractionat...

    Eiji Ohtani, Takumi Kato, Hiroshi Sawamoto in Nature (1986)

  7. No Access

    Article

    Single crystal growth of the modified spinel (β) and spinel (γ) phases of (Mg,Fe)2SiO4 and some geophysical implications

    Single crystals of ferromagnesian orthosilicates with modified spinel (β) and spinel (γ) structure as large as 500 μm have been grown by solid state crystallization at high temperature and high pressure using ...

    Hiroshi Sawamoto in Physics and Chemistry of Minerals (1986)

  8. No Access

    Article

    Postspinel Phase of Forsterite and Evolution of the Earth's Mantle

    THIS is the first announcement of success in the experimental confirmation of the postspinel phase of forsterite at high pressure and high temperature. Forsterite (Mg2SiO4) decomposes to periclase (MgO) and stish...

    MINEO KUMAZAWA, HIROSHI SAWAMOTO, EIJI OHTANI, KAZUAKI MASAKI in Nature (1974)