CALORIMETRIC STUDY OF 3-BROMOPENTANE - CORRELATION BETWEEN STRUCTURAL RELAXATION-TIME AND CONFIGURATIONAL ENTROPY

Heat capacities of glassy, liquid, and crystalline 3-bromopentane were measured with an adiabatic calorimeter in the temperature range 7-300 K. From these data, configurational entropy S-c of the Liquid and undercooled liquid states was evaluated in the temperature range 107-298 K. The relation between the configurational entropy and dielectric relaxation time reported by Berberian and Cole was reproduced well by the Adam-Gibbs theory over the entire temperature range covering the relaxation time from 10 ps to 1 ks. The configurational entropy of a cooperative domain, the number of molecules in a cooperative domain, and the molar activation free energy were determined in the framework of the Adam-Gibbs theory.