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:
影响因子:
--
通讯作者:
Liu Xiao-Lin(刘小林)
中科院分区:
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)
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.
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影响因子:
44.1
作者:
CHILDS, BG
通讯作者:
CHILDS, BG
DOI:
10.1016/s1380-7323(04)80039-6
发表时间:
2004
期刊:
Theoretical and Computational Chemistry
影响因子:
--
作者:
H. Eschrig;M. Richter;I. Opahle
通讯作者:
H. Eschrig;M. Richter;I. Opahle
影响因子:
3.7
作者:
D. Koudela;M. Richter;A. Mobius;K. Koepernik;H. Eschrig
通讯作者:
D. Koudela;M. Richter;A. Mobius;K. Koepernik;H. Eschrig
影响因子:
3.7
作者:
Jin-Cheng Zheng
通讯作者:
Jin-Cheng Zheng
影响因子:
3.3
作者:
Gonze, X;Beuken, JM;Allan, DC
通讯作者:
Allan, DC