The optical spectral band positions and EPR g-factors (gǁ, g⊥)for the tetragonal Ce3+

centers in YPO4 and LuPO4 crystals with the zircon-structure were calculated using

a complete diagonalization (of the energy matrix) method (CDM) related to 4f1

ions in tetragonal symmetry. In this method, the Zeeman interaction term were

added to the Hamiltonian in the conventional CDM and so no perturbation

calculations were required to obtain the g factors. The crystal-field parameters used

in the calculations were obtained from the superposition model in which the local

lattice relaxation related to the bonding lengths was considered. The calculated

results were in reasonable agreement with the experimental values. It was found

that the four observed optical bands for both the systems can be attributed to Ce3+

ions in a tetragonal crystal field.

Investigations of the Optical Spectra and EPR g-Factors for the Tetragonal Ce3+

Centers in YPO4 and LuPO4 Crystals. H.G.Liu, W.C.Zheng, W.L.Feng :

Philosophical Magazine Letters, 2009, 89[4], 306-11