Table 2.

FTIR assignments for Al₂O₃–PbO–B₂O₃–SiO₂–BaO glasses.

Vibration bond and functional groups (cm−1)	Glass samples
	S1	S2	S3	S4
O–Si–O bending vibration mode	550	550	560	560
Bending vibration B–O–B	690	701	703	701
B–O stretching of tetrahedral BO4 unit	1076, 971	1076, 906	1039, 947	1076, 938
B–O stretching of trigonal BO3	1453, 1247	1388, 1202	1388, 1202	1388, 1202