A Review on Infrared Spectroscopy of Borate Glasses with Effects of Different Additives
Figure 2
Possible structural units of PbO-B2O3 glasses: (a) three coordinated boroxol rings modified by Pb2+; (b) formation of Pb–O–B covalent bands; (c) bridge networks between [BO3] and [BO4] units; (d) complex structures of Pb2+-modified boron–oxygen rings and chains [34].