Thermodynamic properties of silicides IV. Molar heat capacity at temperatures from 7 K to 340 K and derived thermodynamic properties to T= 2200 K of molybdenum disilicide (MoSi 2.067 ± 0.002)

The molar heat capacity of molybdenum disilicide MoSi 2.067 ± 0.002was measured from T= 7 K to T= 340 K by adiabetic calorimetry. Our results show that no phase transition is present, but a slight anomaly was observed in the region of T= 200 K. From our results, the standard molar entropy Δ o T S m o(MoSi 2.067 ± 0.002,cr)/R = 7.298.15 K; on the basis of this result, the function Φ m o(MoSi 2.067 ± 0.002,cr, 298.15 K)/ R= 3.002. Heat capacities derived from transient heat-pulse calorimetry from T= 0.2 K to T= 7 K, and results from high-temperature adiabatic and drop calorimetry from T= 300 K to T= 2200 K, together with the heat capacities obtained in this work, allowed the estimation of thermodynamic functions to T= 2200 K.