レーザー加熱式ダイヤモンドセルを用いた (Mg,Fe)SiO3ポストペロフスカイト相の電気伝導度測定

レーザー加熱式ダイヤモンドセルを用いた (Mg,Fe)SiO3ポストペロフスカイト相の電気伝導度測定
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使用激光加热金刚石池测量 (Mg,Fe)SiO3 后钙钛矿相的电导率

DOI:
10.4131/jshpreview.18.260
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发表时间:
2008
期刊:
The Review of High Pressure Science and Technology
影响因子:
--
通讯作者:
K. Shimizu
K. Shimizu
中科院分区:
--
文献类型:
--
作者:
K. Ohta;K. Hirose;R. Sinmyo;S. Onoda;K. Shimizu

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最近,我们在激光加热的金刚石对顶砧单元(DAC)中测量了(Mg0.9Fe0.1)SiO 3钙钛矿和后钙钛矿在高压和高温下的电导率。结果表明,在相同压力范围内,后钙钛矿的电导率大于102 S/m,比钙钛矿高3个数量级,且电导率随温度变化不大。核幔边界上的高导电性后钙钛矿层将通过电磁耦合增强流体核和固体地幔之间的角动量交换,这可以解释观测到的十年时间尺度上的日长变化。地幔底部电导率的异质性很可能取决于边界区域的化学变化,而不是温度的波动。
Recently we have measured the electrical conductivity of (Mg0.9Fe0.1)SiO3 perovskite and post-perovskite at high pressure and temperature in a laser-heated diamond-anvil cell (DAC). The results demonstrate that the conductivity of post-perovskite is > 102 S/m, higher by three orders of magnitude than that of perovskite at similar pressure range, and does not vary greatly with temperature. The highly conductive post-perovskite layer above the core-mantle boundary would, by electromagnetic coupling, enhance the exchange of angular momentum between the fluid core and solid mantle, which can explain the observed changes in length of a day on decadal timescales. Heterogeneity in the conductivity of the lowermost mantle is likely to depend on changes in chemistry of the boundary region, not fluctuations in temperature.
Fe3O在钙钛矿中的高溶解度和后钙钛矿相变
DOI: --
发表时间: 2007
期刊: Physics of the Earth and Planetary Interiors 160
影响因子: --
作者:
S. Tateno;K. Hirose;N. Sata;Y. Ohishi
通讯作者: Y. Ohishi
DOI: 10.1126/science.1095932
发表时间: 2004-05-07
期刊: SCIENCE
影响因子: 56.9
作者:
Murakami, M;Hirose, K;Ohishi, Y
通讯作者: Ohishi, Y