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
复制标题
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
复制
发表时间:
2008
期刊:
影响因子:
--
通讯作者:
K. Shimizu
中科院分区:
文献类型:
--
作者:
K. Ohta;K. Hirose;R. Sinmyo;S. Onoda;K. Shimizu
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.
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
影响因子:
56.9
作者:
Murakami, M;Hirose, K;Ohishi, Y
通讯作者:
Ohishi, Y