Abstract
The complete diagonalization (of energy matrix) method founded on the two-spin-orbit-parameter model is employed to calculate uniformly the optical and EPR spectral data for Cr3+ ions at the trigonal octahedral Ga3+ site of La3Ga5GeO14 (LGGO) crystal. Differing from the one-spin-orbit-parameter model in the conventional crystal field theory where the contribution only from spin-orbit parameter of central dn ions is considered, the present model takes account of the contributions from both the spin-orbit parameters of dn ion and ligand ion via covalence effect. The calculated results show that the observed eight optical and EPR spectral data (five optical bands and three EPR parameters g//, g⊥ and D) can be rationally explained with only three adjustable parameters. The small impurity-caused local lattice relaxation is due to the similarity of valence state and size between the substitutional ion Cr3+ and the host ion Ga3+.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
