Abstract
The optical and paramagnetic resonance spectra have been obtained for divalent nickel ions in BaO⋅(5.1-1.5)B2O3, SrO⋅(3-1.5)B2O3 and CaO⋅(3-1.5)B2O3 glasses. The coordination about the nickel ion sites is found to be octahedral in all the glasses. Absorption bands due to tetrahedrally coordinated nickel ions are not observed. The crystal field splitting parameter 10 Dq decreases with the amount of alkaline earth contents in these three series of glasses, and also decreases in the sequence of CaO, SrO and BaO containing glasses if these alkaline earth contents are the same in each series of glasses. The value of the Racah parameter B and the spin-orbit coupling coefficient are both less than those values for free nickel ion. This fact is accounted for by introducing weak covalent Ni-O bonds. The covalency is found to become predominant in the order of BaO, SrO and CaO containing glasses.
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