The Review of High Pressure Science and Technology
Online ISSN : 1348-1940
Print ISSN : 0917-639X
ISSN-L : 0917-639X
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Showing 1-13 articles out of 13 articles from the selected issue
Foreword
Reviews —Progress in Researches on Core-Mantle Interactions and Coevolution—
  • Yu NISHIHARA, Noriyoshi TSUJINO, Tomoaki KUBO, Daisuke YAMAZAKI, Shunt ...
    2020 Volume 30 Issue 2 Pages 78-84
    Published: 2020
    Released: October 23, 2020
    JOURNALS FREE ACCESS

    A new high-pressure deformation apparatus D111-type apparatus, which is a larger version of the deformation T-Cup, was recently installed on a synchrotron beamline NE7A at PF-AR, KEK, Tsukuba, Japan. In this apparatus, well-controlled deformation experiments can be conducted up to ~30 GPa by driving two opposed second-stage anvils in the Kawai-type multi-anvil assembly. High-pressure and high-temperature deformation experiments with quantitative stress and strain measurements have been carried out using the D111-type apparatus in conjunction with synchrotron radiation. Some studies have been conducted to investigate deep Earth rheology including rheology of hcp iron, rheology of bridgmanite and post-spinel, and olivine-ringwoodite phase transformation under deformation.

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  • Asami SANO-FURUKAWA, Shoichi ITOH, Akimasa SUZUMURA, Yuichiro UENO, Hi ...
    2020 Volume 30 Issue 2 Pages 85-94
    Published: 2020
    Released: October 23, 2020
    JOURNALS FREE ACCESS

    Minerals and rocks exhibit various isotope compositions depending on their origins and histories. In interpreting their isotopic variations, the equilibrium isotope fractionation factor is a key because it depends on the environment parameters such as temperature. Recent studies have shown that the effect of pressure on the isotope fractionation, which was considered negligible compared to temperature, is significant under the conditions of the Earth's interior. In this article we review recent advances in experimental studies to determine the isotope fractionation of iron and hydrogen at high pressure over several GPa, discussing their issues and future perspectives.

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  • Masayuki NISHI
    2020 Volume 30 Issue 2 Pages 95-101
    Published: 2020
    Released: October 23, 2020
    JOURNALS FREE ACCESS

    Water content in the Earth's deep interior is still controversial. In this article, recent experimental studies on hydrous phases, which play an important role in the transportation of water into the deep mantle, were reviewed. In-situ X-ray diffraction measurements combined with multi-anvil apparatus and laser-heated diamond anvil cell techniques clarified phase transitions and solid solutions of hydrous phases over a wide composition range in the ternary MgSiO4H2-AlOOH-FeOOH system under pressures. Based on these results, deep water transportation to the deep lower mantle are discussed.

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  • Haruhiko DEKURA
    2020 Volume 30 Issue 2 Pages 102-110
    Published: 2020
    Released: October 23, 2020
    JOURNALS FREE ACCESS

    In this article, recent progress on our first-principles calculations of lattice thermal conductivities of lower mantle minerals is reviewed. Effective thermal conductivity at the deepest mantle is modeled based on the compositional average. Heat flux from the core to mantle is then quantitatively estimated.

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  • Hidenori TERASAKI
    2020 Volume 30 Issue 2 Pages 111-117
    Published: 2020
    Released: October 23, 2020
    JOURNALS FREE ACCESS

    To constrain the core compositions of terrestrial planets, sound velocity and density of liquid Fe-Ni-S and Fe-Ni-Si alloys were measured up to 14 GPa. Addition of S reduces the P-wave velocity and bulk modulus of liquid Fe-Ni while addition of Si rises the P-wave velocity and does not affect on the bulk modulus in the present pressure range. Based on the obtained elastic properties of liquid Fe-Ni-S and Fe-Ni-Si, the compositions of planetary cores are estimated by matching the planetary geodesy data to 3-7 wt%S or 7-14 wt%Si for Mercury and 30-34 wt%S or 28-33 wt%Si for Mars.

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Reviews: JSHPST 30th Anniversary
Review: 2019 JSHPST Award
  • Taku TSUCHIYA
    2020 Volume 30 Issue 2 Pages 140-155
    Published: 2020
    Released: October 23, 2020
    JOURNALS FREE ACCESS

    Recent progress in theoretical mineral physics based on the ab initio quantum mechanical computation method has been dramatic in conjunction with the advancement of computer technologies. It is now possible to predict stability and several physical properties of complex minerals quantitatively not only at high pressures but also at high temperatures with uncertainties that are comparable to or even smaller than those attached in experimental data. Our present challenges include calculations of high-P,T elasticity to constrain the lower mantle mineralogy, transport properties such as lattice thermal conductivity, and further extensions to terapascal phase equilibria of Earth materials for studying planetary interiors.

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Review: 2019 JSHPST Award for Young Scientists
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