Low-temperature heat capacity of anisotropic crystals lamellar molybdenum disulfide

Abstract

Heat capacities of natural molybdenite crystals were made to test the T2 limiting law for the heat capacity of a lamellar lattice near T --> 0. The findings are at variance with those of Smith et al. and accord with theoretical studies of Newell in that the T3 limiting law is upheld. The results also permit a more accurate evaluation of the thermodynamic functions: at 298.15 K Cp(T), So(T), and -{Go(T) - Ho(0)}/T are (15.19 +/- 0.03), (14.96 +/- 0.02), and (6.475 +/- 0.03) calth K-1 mol-1.