Scaling behavior of non-volume-dependent heat capacity in solids

Abstract

Heat capacity is an important thermophysical property in solids. The previous studies show that the experimental heat capacity mainly includes the harmonic and anharmonic heat capacity. In this paper, we analyze the non-volume-dependent heat capacity CT of reference solids in the temperature range from several Kelvin to melting temperature, and first systematically study the scaling behavior of the non-volume-dependent heat capacity in temperature and volume dimensions. In the new model, the non-volume-dependent heat capacity is equivalent to the kinetic heat capacity which can be scaled by Debye function in temperature dimension, and the potential heat capacity is linearly dependent on the thermal expansion. The results are different from the previous studies, and are important to quantitatively separate the potential and kinetic heat capacity from the experimental heat capacity.