Wavenumber (cm⁻¹)

Assignment

Ref

670

Symmetric stretching of link O-P-O in Q² group

[56]

720

Chain type metaphosphate Q² group

[27] [56]

770

B-O bonding in BO₄ units

[57]

950

B-O bonding in BO₄ units

[48] [56]

1160

symmetric stretching of non-bridging oxygen in Q² units

[56]

1250 - 1300

asymmetric stretching vibration of non-bridging oxygen atoms in Q² units

[58]