Thermodynamics of Formation of HoGe3-x and HoGe2-y Higher Holmium Germanides

L.Goncharuk,
 
V.Sidorko,
 
I.M.Obushenko
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2012, #05/06
http://www.materials.kiev.ua/article/1040

Abstract

The Gibbs energy, enthalpy, and entropy of formation of HoGe3-x (HoGe2,7) and HoGe2-y (HoGe1,8) from solid compounds are determined by e.m.f. measurement in the temperature range 770–965 K. The formation enthalpy of the highest holmium germanide is in good agreement with ΔfH0 (HoGe2,7) calculated from the limiting mixing enthalpy of Ho in liquid germanium on the assumption that for solid alloys in the [HoGe2,7 + Ge] region remains the same as for liquid alloys.


ENTHALPY, ENTROPY, GERMANIUM, GIBBS FREE ENERGY, HOLMIUM, THERMODYNAMIC PROPERTIES