A thermoanalytical investigation of the thermodynamic properties of tin telluride

Abstract

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

Partial Pressures and Thermodynamic Properties of PbTe ‐ SnTe Solid and Liquid Solutions with 13, 20, and 100 Mole Percent SnTe

“…These values of P2 can be fit with a standard deviation of 0.90% by the equation log P2(atm) = -9266.6/T + 5.1419 for 0 -< x < 0.20 [41] State of ionization of the metal vacancy acceptors in PbSnTe.-The state of ionization of the native acceptors in the semiconducting PbSnTe solid solutions can be established by comparing the values ofy -1/2 for Te-saturation given in Table IX with published results (5) for crystals that were first Te-saturated at fixed high temperature, quenched, and then the Hall coefficient, RTv, measured at 77 K. The results of the Hall measurements are shown for x = 0.13 and 0.20 as open symbols in Fig. 10 in which the apparent hole concentration, # # 1~eRr7 [42] is plotted on a logarithmic scale as a function of the reciprocal of the saturation temperature. Data for Pb-Snsaturation are also shown along the lower part of each curve.…”

Calculation method of free enthalpy of liquid phase using data of phase diagram application to Pd–Ge and Pt–Ge

“…The phase diagram of the system Sn-Te exhibits one intermediate compound SnTe with congruent fusion [17] whose enthalpy and entropy of formation we knew [18,19] (respectively −42.34 kJ/mol and −18.64 J/mol K referred to both liquid components and to a mole of atoms). The enthalpy of formation of the liquid was measured by several authors [20][21][22][23].…”