The heats of formation and fusion of SnTe were determined in a differential thermal analysis calorimeter. Its free energy of formation was calculated by the analyses due to Wagner and Jordan using this heat of fusion and liquidus data. The experimentally determined value of the heat of formation and the calculated free energy of formation were combined to obtain the entropy of formation. The thermodynamic properties were interpreted in terms of the structure and bonding of the compound.The system Sn-Te, as shown in the phase diagram (Fig. 1) [1, 2], contains only one compound, SnTe. This melts congruently and has a narrow range of homogeneity (50.1-50.9 at. % Te). This compound has gained prominence as a material for generation and detection of infrared radiation [3] and thermoelectric energy conversion [4]. The thermodynamic properties of tin telluride have not been systematically investigated. The available data are limited and show wide disagreement. For example, the published values of its heat of fusion, based on two different techniques, are 7.9 and 10.8 kcal/mole, respectively [5,6]. Hirayama