کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1599748 | 1515846 | 2015 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The native point defects in C14 Mg2Ca Laves phase: A first-principles study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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![عکس صفحه اول مقاله: The native point defects in C14 Mg2Ca Laves phase: A first-principles study The native point defects in C14 Mg2Ca Laves phase: A first-principles study](/preview/png/1599748.png)
چکیده انگلیسی
The native point defects in C14 Mg2Ca Laves phase are studied from the first-principles density functional theory calculations within GGA approximation. The defect formation energies indicate that anti-site defects are energetically favored over vacancies. Under Mg-rich and even general Ca-rich condition, defect MgCa of Mg anti-site on Ca sublattice is favorable owing to the lowest formation energy. The CaMg2 defect of Ca anti-site on Mg2 sublattice is also likely dominant only under extreme Ca-rich environment. The present results could explain reasonably the asymmetric off-stoichiometry of Mg2Ca. The effective point defect concentrations of Mg2Ca as a function of composition and temperature at experimental range are also calculated from a canonical statistical model, and the derived results show a linear relationship between the logarithm of defect concentration and Tâ1. Geometrical factor is further studied, and it is found that atomic size possesses an obvious influence on the structure of point defect in Mg2Ca. The electronic feature is further studied to reveal underlying mechanism for formation of point defects.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 65, October 2015, Pages 29-34
Journal: Intermetallics - Volume 65, October 2015, Pages 29-34
نویسندگان
Lin Shao, Tao-Tao Shi, Jie Zheng, Xiong-Ze Pan, Bi-Yu Tang,