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Thermochemistry of (germanium + tellurium): I. Standard molar enthalpy of formation ΔfHm° 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)

✍ Scribed by Iwona Tomaszkiewicz; G.A. Hope; P.A.G. O’Hare

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
527 KB
Volume
27
Category
Article
ISSN
0021-9614

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✦ Synopsis

The standard massic energy change at the temperature T = 298.15 K for the reaction: GeTe(cr)+5F2(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 DfH°m(GeTe, cr, 298.15 K)=-(18.224.6) kJ•mol -1 . On the basis of that result, and three closely agreeing values recalculated from literature sources, DfH°m(GeTe, cr, 298.15 K) = -(2023) 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.

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