Local-structure model ofK+site inKTaO3:Fe3+

Abstract

We study a local-structure model suggested recently by Laguta et al. for the ${\mathrm{K}}^{+}$ site in ${\mathrm{KTaO}}_3$:${\mathrm{Fe}}^{3+}$. It is shown to be unreasonable for explaining the unusually large value of the EPR parameter D from calculations on D. A new assumption on the local structure is proposed.