Deformation of (mg 0:9 ,fe 0:1 )sio 3 Perovskite Aggregates up to 32 Gpa
Deformation of (mg 0:9 ,fe 0:1 )sio 3 Perovskite Aggregates up to 32 Gpa
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(mg 0:9 ,fe 0:1 )sio 3 钙钛矿聚集体的变形高达 32 Gpa
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通讯作者：
R. Hemley
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作者：
Se bastien Merkel;H. Wenk;J. Badro;G. Montagnac;P. Gillet;H. Mao;R. Hemley
利用径向x射线衍射和金刚石砧细胞作为变形装置，对（Mg 0:9 Fe 0:1） sio3钙钛矿在高达32 GPa的原位剪切应力和变形机制进行了室温研究。钙钛矿骨料支撑的单轴应力持续增加，压力达到10.9（þ 1.9） GPa至32（þ 1） GPa。我们的测量结果显示，样品中没有明显的晶格优选取向，这表明在这些条件下，位错滑动变形不是主要的变形机制。假设地球深部地震各向异性的根本原因是弹性各向异性和晶格优先取向的结合，我们的结果表明，在本实验条件下变形的硅酸盐钙钛矿不会是地震各向异性的来源。
Room temperature investigations on the shear stress and deformation mechanisms of (Mg 0:9 Fe 0:1)SiO 3 perovskite are performed in situ up to 32 GPa using radial X-ray diffraction and the diamond anvil cell as a deformation apparatus. The uniaxial stress supported by the perovskite aggregate is found to increase continuously with pressure up to 10.9(þ 1.9) GPa at 32(þ 1) GPa. Our measurements show no development of significant lattice preferred orientations in the sample, which indicates that deformation by dislocation glide is not the dominant deformation mechanism under these conditions. Assuming that the underlying cause for seismic anisotropy in the deep Earth is elastic anisotropy combined with lattice preferred orientation, our results indicate that silicate perovskite deformed under the conditions of this experiment would not be the source of seismic anisotropy.