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Density-functional Monte-Carlo simulation of CuZn order-disorder transition

机译:CuZn有序-无序跃迁的密度泛函蒙特卡洛模拟

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摘要

We perform a Wang-Landau Monte-Carlo simulation of a Cu_(0.5)Zn_(0.5) order-disorder transition using 250 atoms and pairwise atom swaps inside a 5 × 5 × 5 body-centered-cubic supercell. Each time step uses energies calculated from density-functional theory via the all-electron Korringa-Kohn-Rostoker method and self-consistent potentials. Here we find that CuZn undergoes a transition from a disordered A2 to an ordered B2 structure, as observed in experiment. Our calculated transition temperature is near 870 K, comparing favorably to the known experimental peak at 750 K. We also plot the entropy, temperature, specific heat, and short-range order as a function of internal energy.
机译:我们对Cu_(0.5)Zn_(0.5)有序-无序跃迁进行了Wang-Landau Monte-Carlo模拟,该过程使用250个原子和成对的5×5×5体心立方超级电池中的成对原子交换进行。每个时间步均使用通过全电子Korringa-Kohn-Rostoker方法从密度泛函理论计算出的能量和自洽电位。在这里,我们发现,CuZn经历了从无序A2到有序B2结构的转变,如实验中所观察到的。与已知的750 K实验峰值相比,我们计算出的转变温度接近870K。我们还绘制了熵,温度,比热和短程顺序作为内部能量的函数。

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  • 来源
    《Physical review》 |2016年第2期|024203.1-024203.5|共5页
  • 作者

    S. N. Khan; Markus Eisenbach;

  • 作者单位

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6114, USA;

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6114, USA;

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  • 正文语种 eng
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