First-principles study of lattice dynamics and thermodynamics of osmium under pressure

First-principles study of lattice dynamics and thermodynamics of osmium under pressure
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压力下锇晶格动力学和热力学的第一性原理研究

DOI:
10.1088/1674-1056/19/2/026301
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发表时间:
2010-02
期刊:
Chinese Phys. B
影响因子:
--
通讯作者:
Liu Xiao-Lin(刘小林)
Liu Xiao-Lin(刘小林)
中科院分区:
其他
文献类型:
--
作者:
Ni Chen(倪晨);Wang Rong-Bo(王荣波);Gu Mu(顾牡);Huang Shi-Ming(黄世明);Liu Bo(刘波);Li Ze-Ren(李泽仁);Liu Xiao-Lin(刘小林)

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我们利用平面波赝势方法对hcp Os金属的晶格动力学、热状态方程和热力学性质进行了第一性原理线性响应计算。通过考虑电子贡献和晶格振动贡献,从计算的亥姆霍兹自由能推导出热力学性质。 Gamma点声子频率与实验值一致,并确定了不同压力下的色散曲线。计算出的体积、体积模量及其作为温度函数的压力导数与实验结果非常一致。计算出的比热表明,由于电子热激发,电子贡献不仅在非常低的温度下而且在高温下都很重要。计算出的极低温度下的德拜温度与实验值吻合较好,直到 100 K 才下降到恒定值。
We have performed the first-principles linear response calculations of the lattice dynamics, thermal equation of state and thermodynamical properties of hcp Os metal by using the plane-wave pseudopotential method. The thermodynamical properties are deduced from the calculated Helmholtz free energy by taking into account the electronic contribution and lattice vibrational contribution. The phonon frequencies at Gamma point are consistent with experimental values and the dispersion curves at various pressures have been determined. The calculated volume, bulk modulus and their pressure derivatives as a function of temperature are in excellent agreement with the experimental results. The calculated specific heat indicates that the electronic contribution is important not only at very low temperatures but also at high temperatures due to the electronic thermal excitation. The calculated Debye temperature at a very low temperature is in good agreement with experimental values and drops to a constant until 100 K.
DOI: 10.1103/revmodphys.25.665
发表时间: 1953-01-01
影响因子: 44.1
作者:
CHILDS, BG
通讯作者: CHILDS, BG
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