Heat Capacities and Phase Transitions of Crystalline 1,3,5-Trichloro-2,4,6-trimethylbenzene

摘要: Heat capacities were measured of 1,3,5-trichloro-2,4,6-trimethylbenzene by adiabatic calorimetry from 3 to 327 K covering the three stable solid phases, II, III, and IV. The phase transitions, III–II IV–III, are first order accompanied a hysteresis effect. IV–III transition occurs at 163.5 when crystal cooled slowly Phase whereas heat capacity anomaly splits into two 158.7 if was rapidly. From time dependence Raman spectra low frequencies, kinetics II–III studied; it is best explained diffusionless nucleation mechanism. thermal can be rationalized assuming existence metastable IV′.