Measurements of electrical conductivity of (Mg,Fe)SiO3 post-perovskite using laser-heated diamond-anvil cell

Kenji Ohta, Kei Hirose, Ryosuke Sinmyo, Suzue Onoda, Katsuya Shimizu

研究成果: Review article査読


Recently we have measured the electrical conductivity of (Mg 0.9Fe0.1)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 > 10 2 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.

ジャーナルReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
出版ステータスPublished - 8 9 2008