Rheology of post-perovskite and the lowermost lower mantle inferred from high pressure experiments

后钙钛矿被认为是最下地幔（D”层）的主要相。因此，我们通过高压实验研究了后钙钛矿与钙钛矿向后钙钛矿相变相关的流变学，以了解地球内部的动力学。粒度是控制构成材料变形和粘度机理的关键参数。根据目前的实验结果，相变过程中晶粒尺寸明显减小，因此预计层中的粘度会降低。

Post-perovskite is considered to be the dominant phase in the lowermost lower mantle(D "layer). Therefore, we investigated rheology of post-perovskite associated with the phase transformation from perovskite to post-perovskite by means of high pressure experiments to understand the dynamics of the earth's interior. Grain size is a key parameter which controls the mechanism of deformation and viscosity of constituting materials. Based on present experimental results, significant grain size reduction occurs during phase transformation and hence viscosity reduction is expected in the Dlayer.