New semiempirical approach in thermochemistry of lanthanides, scandium and yttrium oxides

A new semiempiric approach to the calculation of thermochemical characteristics (enthalpy, sublimation, dissociation, disproportionation, atomization, etc.) of gaseous and crystal scandium, yttrium and lanthanide oxides, based on a fundamental assumption that potential energy of a system is the sum of couple interactions, is suggested. The thermodynamic values calculated are in a good agreement with the known experimental data