Abstract
The electron spin resonance (ESR) and optical absorption spectra of Cu2+ were measured in thallium borate glasses in order to investigate the effects of glass transition temperature,T g, upon the responses of cupric ion in alkali borate glasses. The ESR of Tl2+ induced byγ-ray irradiation was also obtained. An abrupt increase in the covalency of in-plane Cu2+-Oπ-bonding was observed in the Tl2O system as well as in the Na2O system in a similar B2O3 composition range althoughT g for the Tl2O glasses has little dependency on the composition compared with the Na2O glasses. The trend in the variation of the S-character of the Tl2+ unpaired electron with composition agreed with that of the covalency of in-plane Cu2+-Oπ-bonding. The structure of the anion group present in Tl2O glasses was also examined by laser reman spectroscopy.
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