STRUCTURE OF THE V_K, CENTRE IN AMF₃ COMPOUNDS

Abstract

The VK centre in AMF3 compounds, exhibits a bent bond configuration. The perovskite lattice is used as a support to calculate the admixture of 2Πg orbital in 2Σv orbital on submitting the F-2 molecular ion to a crystal field of C2v symmetry. Moreover, one shows that the VK centre may be used to evidence the tetragonal distorsion at 124 K in RbCdF3