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The heat capacities of manganese disulfide and manganese ditelluride were determined by adiabatic calorimetry in the range 5–350°K. Lambda‐type transitions are present in both compounds with maxima at 47.93°K for MnS2 and at 83.0°K for MnTe2. Entropies, enthalpies, and Gibbs energy function values are calculated and tabulated. At 298.15°K they are: S°  =  23.88cal/mole⋅°K,H° − H0°  =  3384cal/mole,− [(G° − H0°) / T]  =  12.258cal/mole⋅°KS°=23.88cal∕mole⋅°K,H°−H0°=3384cal∕mole,−[(G°−H0°)∕T]=12.258cal∕mole⋅°K for MnS2 and 34.66, 4416, and 19.847 for MnTe2. The clearly cooperative entropy increments are only 0.71 cal/mole⋅°K for MnS2 and 0.80 for MnTe2. Available magnetic susceptibility data are interpreted in terms of zero‐field splitting of the 6S5/26S5∕2 state of the manganese 3d53d5 electrons. The resulting contributions to the heat capacity are evaluated. At 298°K the combined λ‐transitional and Schottky contributions to the entropy are 2.6 and 2.4 cal/mole⋅°K for MnS2 and MnTe2, respectively

Manganese Disulfide (Hauerite) and Manganese Ditelluride. Thermal Properties from 5 to 350°K and Antiferromagnetic Transitions