Data on the structure of bismuth borate glasses containing oxides of elements of the second group are presented. It was found that in all bismuth borate glasses, boron ions are present in two coordination states, forming complexes from the [BO 3 ] and [BO 4 ] groups. Bi 2 O 3 at a mass content in glasses of 20 - 40% does not actively influence the structural state of boron ions. The main bismuth-oxygen structural groups are [BiO 6 ].
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