The thermodynamic calculations of dissociation of LiAlO2 and LiGaO2 as
function of temperature and oxygen pressure are presented. It has bee
n found that LiGaO2 evaporates congruently at the melting point under
the oxygen pressure equal to 1.10(-5) atm. LiAlO2 evaporates incongrue
ntly, the equilibrium oxygen partial pressure at the melting point is
equal to 9.6.10(-5) atm and the partial pressure of Li and Al oxides d
ecrease with increasing of oxygen pressure.