Modified Peierls–Nabarro dislocation equation for \( \left\langle {\text{110}} \right\rangle {\{ 1\bar{1}0\} } \) dissociated superdislocations in perovskite CaSiO
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- 作者：ShaoRong Li ; XiaoZhi Wu ; Tao Zhang ; YuXian Tian…
- 关键词：Core structure ; Dissociated width ; CaSiO3
- 刊名：Physics and Chemistry of Minerals
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：43
- 期：8
- 页码：563-570
- 全文大小：670 KB
- 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Mineralogy
Crystallography
Geochemistry
Mineral Resources - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-2021
- 卷排序：43
文摘
In the paper, we investigate the core width of superpartials and dissociated width of the 〈110〉{1–10} superdislocations in CaSiO3 perovskite under pressures of 30 and 100 GPa by using the modified P–N dislocation equation. Our results show that when taking into account the discrete effect correction, core width of superpartials and dissociated width become much wider, and both of them increase significantly with the increase of the superdislocation angle. Furthermore, it is found that the dissociated width and core width of superpartials are determined by value of the unstable stacking fault energy and antiphase boundary energy, which are independent of the position of unstable stacking energy. Interestingly, the Peierls stress of superpartials can be predicted by using the variational method to solve the modified P–N dislocation equation.