Chin. Phys. Lett.  2014, Vol. 31 Issue (06): 066202    DOI: 10.1088/0256-307X/31/6/066202
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Transport Properties and the Entropy-Scaling Law for Liquid Tantalum and Molybdenum under High Pressure
CAO Qi-Long**, HUANG Duo-Hui, YANG Jun-Sheng, WAN Ming-Jie, WANG Fan-Hou
Key Laboratory of Computational Physics, Yibin University, Yibin 644007
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CAO Qi-Long, HUANG Duo-Hui, YANG Jun-Sheng et al  2014 Chin. Phys. Lett. 31 066202
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Abstract Molecular dynamics simulations are applied to study the transport properties, including the self-diffusion coefficient and viscosity, of liquid tantalum and molybdenum under high pressure conditions. The temperature dependence of self-diffusion coefficient, viscosity and the pair correlation entropy under high pressure conditions are investigated. Our results show that the Arrhenius law well describes the temperature dependence of self-diffusion coefficients and viscosity under high pressure, and the diffusion activation energy decreases with increasing pressure, while the viscosity activation energy increases with increasing pressure. The temperature dependence of the pair correlation entropy is well described by 1/T scaling. Furthermore, we find that the entropy-scaling laws, proposed by Rosenfeld for self-diffusion coefficients and viscosity in simple liquids under ambient pressure, still hold well for liquid tantalum and molybdenum under high pressure conditions.
Published: 26 May 2014
PACS:  62.50.-p (High-pressure effects in solids and liquids)  
  65.40.gd (Entropy)  
  66.20.-d (Viscosity of liquids; diffusive momentum transport)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/31/6/066202       OR      https://cpl.iphy.ac.cn/Y2014/V31/I06/066202
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CAO Qi-Long
HUANG Duo-Hui
YANG Jun-Sheng
WAN Ming-Jie
WANG Fan-Hou
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