THE HEAT-CAPACITY OF TITANIUM DISILICIDE

The heat capacity of TiSi2 has been measured in the temperature range 105-500 K. The heat capacity of TiSi2 varies monotonically between tem peratures of 100 and 500 K with a reference value of 22.0 +/- 0.2 J/g atom K at 298.15 K. Based upon our heat capacity data, the standard mo lar entropy of TiSi2 at 298.15 K is estimated to be 22.2 +/- 0.8 J/g a tom K. Our data support estimates of the higher temperature heat capac ity of TiSi2 based upon previously measured heat capacities of differe nt, but similar, substances. A number of TiSi2 samples were prepared b y rapidly quenching (> 10(5) K/s) from the melt. The structure and the measured heat capacity of these samples were similar to those of well annealed samples, underscoring the thermal stability of this material .