THERMODYNAMIC PROPERTIES OF SILICIDES .4. MOLAR HEAT-CAPACITY AT TEMPERATURES FROM 7K TO 340 K AND DERIVED THERMODYNAMIC PROPERTIES TO T=2200 K OF MOLYBDENUM DISILICIDE (MOSI2.067+ -0.002)/

The molar heal capacity of molybdenum disilicide MoSi2.067+/-0.002 was measured from T = 7 K to T = 340 K by adiabatic calorimetry. Our resu lts 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 m olar entropy Delta(0)(T)S(m) degrees(MoSi2.067+/-0.002,cr)/R = 7.394, where T = 298.15 K; on the basis of this result: the function Phi(m) d egrees(MoSi2.067+/-0.002,cr,298.15 K)/R = 3.002. Heat capacities deriv ed from transient heat-pulse calorimetry from T = 0.2 K to T = 7 K, an d results from high-temperature adiabatic and drop calorimetry from T = 300 K to T = 2200 K, together with the heat capacities obtained in t his work, allowed the estimation of thermodynamic functions to T = 220 0 K. (C) 1996 Academic Press Limited