Synthesis, Structural and Optical Investigations of (Pb, Bi)TiO₃ Borosilicate Glasses

Table 3

Assignment of infrared and Raman bands in the spectra of different glass samples.

Wavenumber (cm^−1)		IR assignments	Raman assignments
IR	Raman
418–437	400–900	Vibrations of metal cations such as Pb^2+ ions and doubly degenerate stretching vibration of BiO3 groups	Metaborate groups and symmetric breathing vibrations of six-member rings with one or two BO3 triangles replaced by BO4 tetrahedra
612–656	—	Combined vibrations of BO4 and PbO4 groups	—
750–756	700–725	Bonding of B–O–B linkages (diborate linkage)	Symmetric breathing vibrations of BO3 triangles replaced by BO4 tetrahedra
1035	820–850	Stretching vibration of B–O–Si linkage	Symmetric breathing vibrations of six-member rings with one or two BO3 triangles replaced by BO4 tetrahedra
987	—	Stretching vibrations of B–O–Bi linkage	—
1106–1121	—	Stretching vibration of BO4 tetrahedra groups	—
1200–1635	—	Asymmetric stretching relaxation of the B–O bond of trigonal BO3 units	—
2265–2343	—	–OH bonding	—
2700–3000	2656–2694	Hydrogen bonding	Hydrogen and –OH bonding
3325–3400	—	Hydroxyl or water groups; and O–H stretching vibrations	—