Construction of the universal pressure scale to the Earth's core

构建地心通用压力表

• 批准号: 20H00187
• 负责人: 大谷 栄治
• 金额: $ 28.2万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2020
• 资助国家: 日本
• 起止时间: 2020-04-01 至 2023-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20H00187/
• 关键词: 圧力スケール; 地球核; X線非弾性散乱; 音速; 高温高圧; レニウム; 絶対圧力スケール

高圧下におけるX線非弾性散乱実験および粉末X線回折実験によって，六方最密充填構造をもつ金属レニウムの縦波速度，横波速度と密度の同時測定を室温において行った．金属レニウムにおいては，230 GPaまでの圧力条件で，縦波，横波については，X線非弾性散乱法によって決定し，密度については，粉末X線回折法を用いて決定することができた．得られた結果を用いて室温における一次圧力スケールの構築を試みた．今回の測定では，理想的な金属レニウム結晶において理論的に期待されるよりも非常に大きな非弾性散乱の横波モードが測定された．この強い横波モードの原因を解明するために，常圧において変形した金属レニウム結晶のX線非弾性散乱実験をおこなうとともに，第一原理計算を行い，結晶の変形組織の非弾性散乱ピークに与える影響を明らかにし，今回の大きな横波のモードの測定結果と矛盾しない計算結果を得ることができた．この結果にもとづいて，金属レニウムによる絶対圧力スケールを決定した．そして，その結果を論文として取りまとめ，国際誌に投稿を行い，現在査読意見にしたがって改訂作業中である．さらに，鉄-ニッケル-ケイ素合金の音速測定を高温高圧下において行っている．また，地球の核を構成する金属鉄の室温における音速を，地球の内核に相当する300 GPaを超える圧力条件において測定し，その結果を学会で発表するとともに，査読論文として国際誌に発表した．

Under high temperature temperature, the powder X-ray is folded back and the six-party closest filling is used to make the wave velocity of the metal, and the shear wave velocity and density of the shear wave are measured at the same time. The temperature at room temperature is measured at the same time. The mechanical properties of the metal are tested at the same time. The tensile strength of the metal, the force condition of 230 GPa, the shear wave and the shear wave are determined by the method of non-destructive scattering. The density is measured by X-ray powder X-ray back-folding method, and the temperature is determined by X-ray powder X-ray back-folding method. The results show that the temperature is measured once at room temperature. This time, the temperature is measured. The ideal mechanical properties of the metal are expected to be very large. The shear wave measurement is very large. The shear wave is very strong. The cause of the shear wave is very strong. The cause of the shear wave is very strong. The reason for the shear wave measurement is to understand the cause of the shear wave. The results of the X-ray diffraction analysis of the non-linear scatter are very important. The results show that there are significant differences in the results of shear wave measurement. The results show that the results are contradictory. The results show that the results are in good agreement with each other. The results show that the results show that the results are in good agreement with each other. The results show that the results show that there are significant differences between the results of the calculation and the results of the calculation. The results show that the results of the calculation show that the results of the calculation are in good agreement with each other, and the strength of the metal is determined. The results show that the data are collected in the text, and the contribution banks of the International Association of Nations. The speed of sound is measured at high temperature and high temperature. The core of the earth is used to measure the speed of sound at room temperature, and the core of the earth is equivalent to 300 GPa under the condition of high temperature and high temperature. Please refer to the list of national journals.

项目成果

Aluminum and hydrogen partitioning between bridgmanite and high-pressure hydrous phases and its application to the lower mantle dynamics

铝和氢在桥锰矿和高压水相之间的分配及其在下地幔动力学中的应用

• 发表时间: 2022
• 作者: Eiji Ohtani;Takayuki Ishii;Anton Shatskiy
• 通讯作者: Anton Shatskiy

Existence of the two-phase mixture of HCP and B2 phases in the inner core

内核中存在 HCP 和 B2 相两相混合物

• 发表时间: 2021
• 作者: E. Ohtani;D. Ikuta;S. Dominijanni;et al.
• 通讯作者: et al.

Role of water in subducting slabs: dry phase transformation kinetics in wet slabs

水在俯冲板片中的作用：湿板片中的干相变动力学

• 发表时间: 2021
• 作者: E. Ohtani;T. Ishii
• 通讯作者: T. Ishii

Sound Velocity Measurements of B2-Fe-Ni-Si Alloy Under High Pressure by Inelastic X-Ray Scattering: Implications for the Composition of Earth's Core

• DOI: 10.1029/2021gl096405
• 发表时间: 2022-08-16
• 期刊: GEOPHYSICAL RESEARCH LETTERS
• 影响因子: 5.2
• 作者: Dominijanni, S.;McCammon, C. A.;Baron, A. Q. R.
• 通讯作者: Baron, A. Q. R.

Back‐transformation mechanisms of ringwoodite and majorite in an ordinary chondrite

• DOI: 10.1111/maps.13543
• 发表时间: 2020-07
• 期刊: Meteoritics & Planetary Science
• 影响因子: 2.2
• 作者: K. Fukimoto;M. Miyahara;T. Sakai;H. Ohfuji;N. Tomioka;Y. Kodama;E. Ohtani;A. Yamaguchi