EPR Study of Fe³⁺–V_Cd and Fe³⁺–Li⁺ Centres in RbCdF₃ and CsCdF₃ Crystals

抄録

EPR measurements on Fe³⁺ centres in RbCdF₃ and CsCdF₃ 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 Fe³⁺ tetragonal centres associated with Cd²⁺ 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 or distortion of fluorine octahedra surrounding Fe³⁺ ions.