Calculation of thermodynamic quantities for carbon tetrachloride (CCI4) close to the ni-IV phase transition

摘要

Abstract-We calculate the thermal expansion α_p, isothermal compressibility k_t and the specific heat, C_i,-C., as a function of pressure using the observed V-P data at room temperature close to the Ⅲ-Ⅳ phase transition in CC1_4. Calculated k_T, α_p, and C_p-C_v, decrease as the pressure increases from phase III to phase IV in this molecular crystal system, as expected. On the basis of our calculations of the k_t, a_p and C_p-C_v, the Pippard relations are established close to the III-IV phase transition in CC1_4, which can be verified experimentally.