Structural and thermochemical studies on Cr2TeO6 and Fe2TeO6

Cr2TeO6 and Fe2TeO6 were prepared by the solid-state reaction route. The cr ystal structure was derived for both compounds from X-ray powder diffractio n data. Cr2TeO6 and Fe2TeO6 are isostructural and have the trirutile struct ure. The Gibbs free energy of formation (Delta (f)G degrees) for Cr2TeO6 an d Fe2TeO6 was obtained from vapor pressure data employing the Knudsen Effus ion Mass Loss technique (KEML) and is given by the relation Delta (f)G degr ees 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.