Thermodynamic and Thermochemical Characteristics of Erbium Silicides

V.Sidorko,
  

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2012, #01/02
http://www.materials.kiev.ua/article/988

Abstract

The Gibbs energies and enthalpy and entropy of formation of erbium silicides ErSi2–b (ErSi1,67), ErSi, ErSi1–х(ErSi0,96), Er5Si4 and Er5Si3 are determined by measuring of electromotive forces in the range 820–1050 K. The enthalpy of ErSi1,67, ErSi, and Er5Si3 in the wide temperature range is studied by the drop calorimetry method. The temperature dependences of the heat capacity, entropy, and reduced Gibbs energy of these compounds are determined from the experimental data. The enthalpies and entropies of polymorphic transformation β-ErSi2–b ↔ α-ErSi2–b and the melting enthalpy and entropy of ErSi2–b5Si3 silicides are also determined.


ENTHALPY AND ENTROPY, ENTHALPY OF FORMATION, ENTROPY OF FORMATION, ERBIUM SILICIDES, GIBBS ENERGY OF FORMATION, HEAT CAPACITY, REDUCED GIBBS ENERGY