EPR study of Fe3+−VCd and Fe3+−Li+ centres in RbCdF3 and CsCdF3 crystals

EPR measurements on Fe 3+ centres in RbCdF 3 and CsCdF 3 for crystals co-doped with Li + ions have been made in the cubic phase of host crystals. In both the crystals spectra from two kinds of Fe 3+ tetragonal centres associated with Cd 2+ vacancy (V Cd ) and Li + ion at the nearest-divalent-cation sites have been observed. From obtained fine structure parameters in the spin Hamiltonian the metal-ligand distances have been determined by the superposition model. The fine structure parameters have been explained well by the obtained metal-ligand distances, which show the contraction ordistortion of fluorine octahedra surrounding Fe 3+ ions.

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