Abstract
In this paper, the nickel site, optical spectra and electron paramagnetic resonance (EPR) g factor of nickel–zinc phosphate glasses have been studied by ligand-field theory. The orbital mixing effect between p and d orbits has been included in the calculation by two-spin–orbit parameter model. The present study shows that nickel occupies the tetrahedral zinc site with cubic symmetry in nickel–zinc phosphate glasses. Unlike the result of previous study that assigns nickel to an octahedral interstitial site, it is an optional explanation for nickel sites in nickel–zinc phosphate glasses by analysing the optical absorption spectra and EPR g factor.
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