Structural and thermochemical studies on Cr2TeO6 and Fe2TeO6

Cr2TeO6 and Fe2TeO6 were prepared by the solid-state reaction route. The crystal structure was derived for both compounds from X-ray powder diffraction data. Cr2TeO6 and Fe2TeO6 are isostructural and have the trirutile structure. The Gibbs free energy of formation (Delta (f)G degrees) for Cr2TeO6 and Fe2TeO6 was obtained from vapor pressure data employing the Knudsen Effusion Mass Loss technique (KEML) and is given by the relation Delta (f)G degrees Cr2TeO6(s) = (- 1651.6 + 0.5683T)+/-15 kJ/mol (1014-1100 K) Delta (f)G degrees Fe2TeO6(s) = (-1234.3 + 0.47292)+/- 15 kJ/mol (979-1052 K) (C) 2001 Elsevier Science B.V. All rights reserved.