The compounds, Cr2TeO6 (s), Fe2TeO6 (s) and Ni3TeO6 (s) were synthesized by solid-state route and characterized using X-ray diffraction technique. Thermal expansion of (FeTeO6)-Te-2 (s) and Ni3TeO6 (s) were studied by high temperature X-ray diffraction technique in the temperature range 298-973 K and 298-923 K, respectively. The average volume thermal expansion coefficient of Fe2TeO6 (s) and ni(3)TeO(6) (s) were determined to be 2.46 x 10(-5) and 3.02 x 10(-5) K-1, respectively. Heat capacity of Cr2TeO6 (s), Fe2TeO6 (s) and Ni3TeO6 (s) was measured, in the temperature range of 300-870K, employing temperature modulated differential scanning calorimeter. The Gibbs energy of formation of Fe2TeO6 (s) and Ni3TeO6 (s) were measured using transpiration method. An empirical function was derived to compute enthalpy of formation of A(n)TeO(6) (s) (where A = various elements of periodic table, n = 2,3 or 6). Self consistent thermodynamic functions of Cr2TeO6 (s), Fe2TeO6 (s) and Ni3TeO6 (s) were calculated. The chemical potential diagrams of A-Te-O (A= Cr, Fe, Te) system were also constructed. (C) 2014 Elsevier B.V. All rights reserved.