Thermodynamics of formation of HoGe and HoGe higher holmium germanides.

The Gibbs energy, enthalpy, and entropy of formation of HoGe (HoGe) and HoGe (HoGe) from solid compounds are determined by emf measurement in the temperature range 770-965 K. The formation enthalpy of the higher holmium germanide is in good agreement with ∆ H° (HoGe) calculated from the limiting mixing enthalpy of Ho in liquid germanium on the assumption that $ \varDelta {\bar{H}_{Ho}} $ for solid alloys in the [HoGe + Ge] region remains the same as $ \varDelta \bar{H}_{Ho}^\infty $ for liquid alloys. [ABSTRACT FROM AUTHOR]