Vaporization, thermodynamics and structures of species in the tellurium + oxygen system

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Abstract
High-temperature mass-spectrometric investigations of the equilibrium vapours over crystalline tellurium dioxide have shown the existence of the molecular species (TeO2)n and (TeO)n, where n= 1, 2, 3, 4 as well as Te2 and O2. Under these conditions the most abundant species are TeO2(g) and TeO(g). Second- and third-law heats of reaction and entropies for the various equilibria among these species have been obtained. Fundamental frequencies obtained from infra-red absorption studies of the species isolated in rare-gas matrices were used for calculations of thermodynamic functions at various temperatures. Heats of atomization for (TeO2)2 and (TeO)2 were obtained. Using the average of the second and third-law heats, ΔH°298= 2.5 ± 2 kcal mol–1, for the reaction TeO(g)=½Te2(g)+½O2(g) one obtains the dissociation energy for TeO(g), D°0= 92.5 ± 2 kcal mol–1. A bent geometry (110°) is indicated for TeO2 and evidence for cyclic structures of (TeO2)2 and (TeO)2 is given.

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