Temperature-dependent Raman spectroscopic study of bismuth borate Bi₂ZnOB₂O₆

A temperature-dependent Raman spectroscopic study on Bi₂ZnOB₂O₆ crystal was carried out to investigate the structure change of the crystal with the increase of temperature. Raman spectra of crystal Bi₂ZnOB₂O₆ were recorded in the spectral range 10-1600 cm^-1 at room temperature first. Compared with the vibrational spectra of the referred compounds, satisfactory assignment of most of the high-energy modes to vibrations of Bi-O, B-O, and Zn-O bonds was achieved. In particular, the Raman high-frequency peak located at 1344 cm^-1 was attributed to the B-O vibration in the BO₃ triangle. This temperature-dependent Raman spectroscopic study was carried out up to 600 ℃. It was found that all the Raman lines exhibit decreases in frequency and the widths of the Raman peaks increase with increasing temperature. No phase transition was observed under 600 ℃.