Wave number (cm−1)

Raman assignment

130 cm −1

Symmetric stretching vibrations of Bi-O-Bi bonds in pyramidal BiO3 units and BiO6 octahedrons.

254 cm −1

Bending vibrations of Zn-O bonds in ZnO4 tetrahedrons.

390 cm −1

Symmetric stretching vibrations of Bi-O-Bi bonds in pyramidal BiO3 units and BiO6 octahedrons.

575 cm −1

Stretching vibrations of Bi-O bonds in BiO6 octahedrons.

920 cm −1

Stretching vibrations of B-O bonds in orthoborate formed by pyramidal BO3 units, stretching vibrations of Bi-O bonds in BiO6 octahedrons.

1250 - 1320 cm−1

Stretching vibrations of Bi-O bonds in pyramidal BiO3 units.

1250 - 1500 cm−1

Stretching vibrations of B-O bonds and stretching vibrations of O3B-O-BO4 bonds in BO3 pyramidal units, Stretching vibrations of B-O-B bonds in pyramidal BO3 units.