Vaporization thermodynamics of the metal-rich molybdenum telluride Mo3Te4: a high-temperature mass-spectrometric study

Viswanathan, R. ; Balasubramanian, R. ; Mathews, C. K. (1989) Vaporization thermodynamics of the metal-rich molybdenum telluride Mo3Te4: a high-temperature mass-spectrometric study Journal of Chemical Thermodynamics, 21 (11). pp. 1183-1191. ISSN 0021-9614

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002196...

Related URL: http://dx.doi.org/10.1016/0021-9614(89)90105-5

Abstract

Vaporization of (molybdenum + tellurium) alloys corresponding to the two-phase field (Mo + Mo3Te4) was studied by using Knudsen-effusion mass spectrometry. The two samples used had initial compositions of 40.3 and 50.1 mass per cent of tellurium, respectively. The vapour phase was found to consist of Te2 and Te. Relations of partial pressure against temperature were determined to be lg(p/Pa) = -(13631 ± 97)(K/T) + (12.999 ± 0.095) for Te2(g), and lg(p/Pa) = -(13238 ± 116)(K/T) + (11.674 ± 0.113) for Te(g), respectively, in the temperature range 960 to 1110 K. Enthalpy changes were derived from the partial pressures for the equilibria: MoTex(s) = Mo(s) + (x/i)Tei(g) and Te2(g) = 2Te(g), where x = 1.3334 with i = 1 or 2. The standard molar enthalpy and standard molar Gibbs free energy of formation of MoTe1.3334 were derived.

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