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Thermodynamic description of the Holmium-Germanium binary system

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Abstract

The Holmium-Germanium system was thermodynamically assessed by the CALPHAD technique based on the available experimental data including the thermodynamic properties and phase equilibria. The solution phases, i.e. liquid, hcp_A3 (Ho), and diamond_A4 (Ge), were described by the substitutional solution model with the Redlich-Kister equation, and all the intermetallic compounds HoGe1.7 (_LT and _HT), HoGe1.8, HoGe2.7, Ho11Ge10, Ho3+Ge4, Ho5Ge4, HoGe, and HoGe1.5 (_LT and _HT) in the Holmium-Germanium system were treated as stoichiometric phases. The compound with a homogeneity range Ho5Ge3, is modeled using two sublattices as (Ho,Ge)0.375(Ho,Ge)0.625. A set of self-consistent thermodynamic parameters for the Holmium-Germanium system was finally obtained. The calculated phase diagram and thermodynamic properties agree reasonably with the literature experimental data.

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Authors and Affiliations

  1. Laboratoire de Thermodynamique et Énergétique, LTE, Université Ibn-Zohr, BP 8106, Agadir, Morocco

    Saïd Kardellass & Najim Selhaoui

  2. Laboratoire de Physicochimie de l’État Solide, ICMMO, Université Paris-Sud, 91405, Orsay Cedex, France

    Colette Servant

Authors
  1. Saïd Kardellass
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  2. Colette Servant
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  3. Najim Selhaoui
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Correspondence to Saïd Kardellass or Colette Servant.

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Kardellass, S., Servant, C. & Selhaoui, N. Thermodynamic description of the Holmium-Germanium binary system. Eur. Phys. J. Spec. Top. 226, 1075–1089 (2017). https://doi.org/10.1140/epjst/e2016-60223-7

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  • DOI: https://doi.org/10.1140/epjst/e2016-60223-7

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