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arXiv 1105.2161cond-mat.mtrl-sci
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第一性原理研究B2-MgRE金属间化合物的温度弹性性质

The temperature-dependent elastic properties of B2-MgRE intermetallic compounds from first principles

Rui Wang, Shaofeng Wang, Yin Yao

摘要:

采用密度泛函理论,在平面波基投影缀加波(PAW)方法的框架下,从第一性原理出发,研究了MgRE(RE=Y,Dy,Pr,Sc,Tb)B2型金属间化合物的弹性性质随温度的变化.我们的计算是基于这样一个事实,即弹性模量作为温度的函数,主要是由于热膨胀。预测结果与基准材料NiAl的实验数据之间的比较提供了良好的协议。在$T=0K$中,我们计算的MgRE金属间化合物的晶格参数和弹性模量值与以前的理论结果和实验数据吻合得很好。随着温度的升高,弹性常数逐渐减小,在较高温度下趋于线性,在零温度附近斜率为零。

英文摘要:

Using the density functional theory (DFT) formulated within the framework of the plane-wave basis projector augmented wave (PAW) method, the temperature-dependent elastic properties of MgRE (RE=Y, Dy, Pr, Sc, Tb) intermetallics with B2-type structure are presented from first-principles. Our calculations are based on the fact that the elastic moduli as a function of temperature mainly results from thermal expansion. The comparison between the predicted results and the available experimental data for a benchmark material NiAl provides good agreements. At $T=0K$, our calculated values of lattice parameter and elastic moduli for MgRE intermetallics show excellent agreement with previous theoretical results and experimental data. While temperature increases, we find that the elastic constants decrease and approach linearity at higher temperature and zero slope around zero temperature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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