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Self-diffusion of oxygen and silicon in MgSiO3 perovskite

机译:MgSiO3钙钛矿中氧和硅的自扩散

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摘要

We present results of simultaneous measurements of self-diffusion of oxygen and silicon in magnesium silicate perovskite. Oxygen diffusion is similar to 2 orders of magnitude faster than Si self-diffusion and Fe-Mg interdiffusion in perovskite, with D-0 = 9.16 x 10(-4) (+0.16/-9.2 X 10(-6)) m(2)/s and Q = 501 +/- 80 kJ/mol at 25 GPa. Despite this high 0 diffusivity, however, the electrical conductivity of the lower mantle will be dominated by electronic conduction and the present-day core is likely to be out of redox equilibrium with the mantle.
机译:我们提出了同时测量氧和硅在硅酸镁钙钛矿中自扩散的结果。氧扩散比钙钛矿中的Si自扩散和Fe-Mg互扩散快2个数量级,D-0 = 9.16 x 10(-4)(+ 0.16 / -9.2 X 10(-6))m( 2)/ s和25 GPa时Q = 501 +/- 80 kJ / mol。尽管具有很高的0扩散率,但是下地幔的电导率将由电子传导控制,并且当今的磁芯很可能与地幔处于氧化还原平衡状态。

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