Thermodynamics of processes of hydrogen sorption by hydrides of intermetallic compounds of CrB structural type

Abstract The intermetallic compounds (IMCs) HfNi, ZrNi, HfCo and ZrCo are studied by thermoanalytical methods. The thermodynamic characteristics calculated from the van't Hoff equation and obtained by the calorimetric method are compared with literature data. The dependence of the partial molar enthalpy on the IMC hydrogen content has a tendency to decrease with increasing hydrogen content in the a solution region; in the region near the α -( α + β ) and ( α + β )- β boundaries there is a discontinuity; in the region of twophase coexistence ΔH H does not depend on the IMC hydride hydrogen content; during the formation of a new phase (monohydride, β hydride) ΔH H increases.