Investigations of the EPR Parameters and Defect Structures of Two Types of Trigonal Cr3+ Centers in CsMgCl3, CsMgBr3 and CsCdBr3 Crystals

Abstract

The EPR g factors g||, g⊥ and zero-field splitting D of trigonal Cr3+-M+ (M+ = Li+, Cu+, Na+) and Cr3+-VB-M3+ (M3+ = Cr3+, In3+, Sc3+, Y3+, Lu3+; VB denotes the B2+ vacancy) centers in some CsBX3 (B = Mg, Cd; X = Cl, Br) crystals are calculated from high-order perturbation formulas based on the two-spin-orbit coupling parameter model of the 3d3 ion in trigonal symmetry. From the calculations, these EPR parameters are reasonably explained and the local lattice distortions caused by the charge compensators M+ or VB are estimated. The results are discussed.