Abstract
Themodynamics of non-stoichiometric compounds, mainly having a fluorite type crystal structure, is briefly reviewed in terms of phase diagram and defect structures at high temperature, standard formation enthalpy and heat capacity, effect of lattice constants on chemical composition of non-stoichiometric compounds doped with various cations, thermal expansion and mechanical properties such as Debye temperature, Grüneisen constant and adiabatic bulk modulus.
