Abstract
Infrared absorption, laser Raman scattering as well as X-ray induced ESR spectra have been measured for lithium fluoroborate and chloroborate glasses. For the glasses with an identical Li 2 O/B 2 O 3 ratio, the chloroborate glasses showed vibrational spectra similar to those observed in the halide free borate glasses, while the fluoroborate glasses showed different ones. ESR spectra confirmed that Cl 2 - radical is formed in the chloroborate glasses upon the X-ray irradiation, but F 2 - radical has not been detected for the fluoroborate glasses even at 77 K. It is concluded that F is covalently bonded to B, but Cl is just present in interstitial sites in the borate glass as a free ion.
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