科研之友
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摘要
The plastic behavior of MgSiO3 perovskite is investigated under pressure conditions similar to those encountered in the Earth%26apos;s lower mantle. The core structures of dislocations with edge and screw characters are determined by means of atomic-scale simulations for the [1 0 0](0 1 0) and [0 1 0](1 0 0) slip systems. The corresponding Peierls stresses increase monotonously with increasing pressure. The edge [0 1 0](1 0 0) dislocation is found to dissociate by climb and to become sessile at high pressure (P %26gt;= 80 GPa). These findings are compared with a continuum Peierls-Nabarro model and with published results in other perovskite materials.
- 出版日期2014-10-15
