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Cite this article as: zhouhongjun,Zheng Run-Lun,Wang Ming-Liang. Effect of Non - harmonic Vibration on Thermal Transport Properties of SiC Graphene [J]. J. At. Mol. Phys.(原子与分子物理学报), 2020, 37: 147 (in Chinese)
Effect of Non - harmonic Vibration on Thermal Transport Properties of SiC Graphene
Hits 107  Download times 29  Received:January 25, 2019  Revised:March 12, 2019
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Key Words   SiC graphene  Debye temperature  Heat capacity  Thermal conductivity  Non - harmonic effect
Author NameAffiliationE-mail
zhouhongjun  
Chongqing 
University 
of 
Arts 
and 
Sciences 
zhouhongjun82@126.com 
Zheng Run-Lun 重庆文理学院  
Wang Ming-Liang 重庆市第八中学校  
Abstract
    Considering the non-harmonic vibration of atoms, the simple harmonic coefficient and non-simple harmonic coefficient of SiC graphene are calculated by solid physics theory and method. The variations of Debye temperature, heat capacity and thermal conductivity with temperature are obtained. And the influence of atomic non-harmonic vibration on the heat transport properties is also discussed. The results indicate that the Debye temperature of SiC graphene increases linearly with the increase of temperature, in the temperature range of 117 K to 126 K. However, both the constant volume specific heat and thermal conductivity decrease nonlinearly with temperature rise, which are concretely expressed as rapidly changing when temperature is lower, then slowly changing when temperature is higher, and tends to be constant at last; After non-harmonic vibration, the data of Debye temperature, constant volume specific heat and thermal conductivity of SiC graphene are greater, smaller and greater than the corresponding simple harmonic approximation values, respectively. The higher the temperature, the greater the difference, that is, the more significant the influence of the non-harmonic effect; The constant volume specific heat and thermal conductivity of two-dimensional planar SiC graphene show the same change law with temperature as three-dimensional bulk SiC crystals, except different dimensions and specific values.

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