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Glasses of general formula xSb 2 O 3 (1-x)B 2 O 3 (0=<x=<0.8) have been prepared by conventional melt- quenching. Mossbauer spectroscopy shows that a fraction of the Sb 3+ is converted to Sb 5+ and this fraction increases with x. High-field 11 B MAS NMR gives well-resolved resonances from boron atoms which are 3- and 4-coordinated...
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