Abstract

The Gibbs free energy, enthalpy, and entropy of the formation of Er₂Ge₅, ErGe₂, ErGe_2-b(ErGe_1,5), Er₃Ge₄, ErGe, Er₁₁Ge₁₀, Er₅Ge₄, and Er₅Ge₃ from solid components are determined by measuring the electromotive forces of high-temperature galvanic cells. The maximum thermodynamic stability is shown by Er₅Ge₃,which is the only congruently melting compound in the Er–Ge system.