The Gibbs energy, enthalpy, and entropy of formation of HoGe3–x (HoGe2.7) and HoGe2–y (HoGe1.8) 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 ∆ f H° (HoGe2.7) calculated from the limiting mixing enthalpy of Ho in liquid germanium on the assumption that \( \varDelta {\bar{H}_{Ho}} \) for solid alloys in the [HoGe2.7 + Ge] region remains the same as \( \varDelta \bar{H}_{Ho}^\infty \) for liquid alloys.
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The authors are grateful to L. A. Duma for X-ray diffraction using a DRON diffractometer and computer recording of the results.
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Translated from Poroshkovaya Metallurgiya, Vol. 51, No. 5–6 (485), pp. 100–105, 2012.
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Goncharuk, L.V., Sidorko, V.R. & Obushenko, I.M. Thermodynamics of formation of HoGe3–x and HoGe2–y higher holmium germanides. Powder Metall Met Ceram 51, 329–332 (2012). https://doi.org/10.1007/s11106-012-9436-z
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DOI: https://doi.org/10.1007/s11106-012-9436-z