第一性原理计算α-ScDz(D=H,He)的弹性常数
First-principles calculation for elastic constants of α-SCDx ( D = H, He)
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摘要: 本文采用第一性原理方法研究了d相钪氢化合物(α-ScH。)和Ot相钪氦化合物(α-ScHe。)的弹性常数,其中x=0,1/4,1/8,1/32表示H原子和He原子在α-ScD,(D=H,He)中的浓度.研究结果表明,对于钪,氢和氦对晶体的弹性性质的影响截然不同.钪氢化合物晶体的弹性常数基本上随着晶体中氢的浓度增加而增加,这跟实验测量得出的结论一致;然而,钪氦化合物体系的弹性常数几乎随着氦浓度的增加而降低.Abstract: The elastic constants of α-ScH (x =0, 1/4, 1/8, 1/32) and α-ScHex(x =0, 1/4, 1/8, 1/32) are studied by the first-principles method. It is found that the addition of hydrogen to the scandium has an effect greatly different from the addition of helium to this rare-earth metal. The elastic constants of the α-ScH system almost increase with hydrogen concentration increasing, which is in agreement with the experimental observation. Whereas, in the case of α-ScH% system, the elastic constants almost decrease with the increase of helium concentration.
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