Thermodynamic and thermochemical characteristics of holmium silicides

Abstract

are determined by the electromotive force method. The heat capacity and enthalpy of HoSi 1.67 in the temperature range 55-2007 K are measured with adiabatic and mixing calorimetry. The enthalpy and entropy of α → β polymorphic transformation and melting of HoSi 1.67 are established. Temperature dependences of the heat capacity, enthalpy, and entropy of HoSi and Ho 5 Si 3 are evaluated based on the behavior of heat capacity of mono-and lower silicides of rare-earth metals and their melting enthalpies in the series from La to Lu.