Influence of Covalency in the Dynamic Jahn—Teller Effect in Al2O3:Ti3+

Abstract

A numerical evaluation of the Jahn—Teller potential energy is presented for the case of ${\mathrm{Ti}}^{3+}$ in ${\mathrm{Al}}_2$ ${\mathrm{O}}_3$. It is found that the crystal-field theory is inadequate to explain the experimental results, whereas the inclusion of covalency effects leads to a good agreement between the experimental results and the theoretical ones.