The standard molar heat capacity measurements on compounds Rb₂TeO₃ (s), Rb₂Te₂O₅ (s) andRb₂Te₄O₉ (s) in the Rb– Te(IV)–O system were taken using differential scanning calorimeter in the temperature range 325–675 K. The compounds were synthesized by solid-state route and characterized using X-ray diffraction technique. The molar heat capacity values were least squares analyzed, and the dependence of the molar heat capacity with temperature can be given as,

C^o_p,m(Rb₂TeO₃, s, T ) /J K^-1mol^-1 = 156.00 + 0.02 (T/ K)-4.12 * 10⁶ (T /K)^-2
C^o_p,m (Rb₂Te₂O₅, s, T ) /J K^-1mol^-1 = 216.50 + 0.03 (T/ K)-2.52 * 10⁶ (T /K)^-2
C^o_p,m (Rb₂Te₄O₉, s, T ) /J K^-1mol^-1 = 351.80 + 0.04 (T/ K)-3.52 * 10⁶ (T /K)^-2

From these data, thermodynamic functions such as enthalpy increment (H^o_T - H^o_298.15o ), entropy (S^o_T ) and Gibbs energy functions (fef) were evaluated.