Specific thermal and thermodynamic properties of the tellurites Fe2(TeO3)3, Fe2TeO5 and Fe2Te4O11

The temperature dependence of the molar heat capacities of the tellurites Fe-2(TeO3)(3), Fe2TeO5 and Fe2Te4O11 were determined. By statistical manipulation of the values obtained, the parameters in the equations for the corresponding compounds showing this dependence were determined using the least-squares method. These equations together with the standard molar entropies were used to determine the thermodynamic functions Delta S-T(0)m(0) , Delta(T)(T), H-m(0) and (Phi(0)(m) + Delta H-T'(0)m(0)/T) for T'=298.15 K.