Melting Enthalpies and High-Temperature Heat Capacities of Lower Silicides of Yttrium-Subgroup Rare-Earth Metals

Abstract

Components of the high-temperature heat capacity of REM silicides, Ln₅Si₃, and variation in their melting enthalpies in the Gd₅Si₃ → Ln₅Si₃ series are analyzed. A method for calculation of high-temperature thermodynamic properties of the compounds to be studied experimentally is proposed. The experimentally determined temperature dependences for the enthalpies of Ln₅Si₃ (Ln = Gd, Er, Lu) compounds are used to calculate the melting enthalpies and temperature dependences of heat capacity for other silicides of yttrium subgroup.