Journal of Chemical Thermodynamics, Vol.27, No.8, 901-919, 1995
Thermochemistry of (Germanium Plus Tellurium) .1. Standard Molar Enthalpy of Formation Delta-H-F-Degrees(M) at the Temperature 298.15 K of Crystalline Germanium Monotelluride GeTe by Fluorine-Bomb Calorimetry - A Critical-Assessment of the Thermodynamic Properties of GeTe(Cr and G) and Gete2(G)
The standard massic energy change at the temperature T = 298.15 K for the reaction : GeTe(cr) + 5F(2)(g) = GeF4(g) + TeF6(g) has been measured in a fluorine-bomb calorimeter, and from it has been derived the standard molar enthalpy of formation Delta(f)H(m)(o)(GeTe, cr, 298.15 K) = -(18.2 + 4.6) kJ . mol(-1). On the basis of that result, and three closely agreeing values recalculated from literature sources, Delta(f)H(m)(o)(GeTe, cr, 298.15 K) = -(20 +/- 3) kJ . mol(-1) is recommended. (Uncertainties in this abstract correspond to twice the standard deviation of the mean.) The conventional standard molar thermodynamic functions of GeTe and GeTe2, both in the ideal-gas state, were calculated by the methods of statistical mechanics. The following thermodynamic properties of GeTe(cr) were critically evaluated : molar enthalpy increments, molar heat capacity, and molar enthalpy of sublimation.