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].

(a)

(b)

(c)

(d)