Abstract
Optical absorption spectra of Ni2+ ion (100-x) (PbO⋅GeO2)⋅xRO⋅0.2wt% NiO glasses are measured, and the results are obtained as follows.The value of 10Dq which represents the intensity of the ligand field shifts toward higher wave number with increasing alkaline earth metal content. The increasing intensity of the ligand field is considered to be the formation of GeO68-, where the glass network was destroyed by alkaline earth metals. In this study, the ν4 peak appears only at 20mol% BaO, which represents a Ni2+ ion with 4-coordination. In other systems the ν4 peak does not appear clearly. It is considered that the Ni2+ ion does not become 4-coordination.According to the measurements of infrared spectra, most of this system consists of Ge6 groups, and the variation of coordination number of Ge with the alkaline earth metal contents hardly appear.
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