Gautason B, Muehlenbachs K
Science. 1993 Apr 23;260(5107):518-21. doi: 10.1126/science.260.5107.518.
Experimental determination of oxygen self-diffusion in CaTiO(3) perovskite, a structural analog of (Mg,Fe)SiO(3) perovskite, confirms a theoretical relation between diffusion constants and anion porosity. Oxygen diffusion rates in (Mg,Fe)SiO(3) perovskite calculated with this relation increase by about eight orders of magnitude through the lower mantle. Electrical conductivity values calculated from these diffusion rates are consistent with inferred conductivity values for the lower mantle. This result suggests that the dominant conductivity mechanism in the deep mantle is ionic.
对钛酸钙钙钛矿（(Mg,Fe)SiO₃钙钛矿的结构类似物）中氧自扩散的实验测定，证实了扩散常数与阴离子孔隙率之间的理论关系。利用该关系计算得出的(Mg,Fe)SiO₃钙钛矿中的氧扩散速率在整个下地幔中增加了约八个数量级。根据这些扩散速率计算出的电导率值与下地幔推断的电导率值一致。这一结果表明，下地幔中主要的导电机制是离子导电。
