IR and Raman Spectra Properties of Bi₂O₃-ZnO-B₂O₃-BaO Quaternary Glass System

Abstract

Among new low-melting-point glasses, bismuth ate glass is deemed to have the most potential as an environmentally friendly replacement for polluting Pb-containing glasses. Current studies of boro-bismuthate glasses focus on the structural influence of the additional oxide in the context of low-melting-point electronic sealing applications. In this study, the structure of quaternary Bi 2 O 3 - ZnO-B 2 O 3 -BaO glasses was investigated spectroscopic ally, with Fourier-transform-infrared (FT-IR) and Raman spectra recorded for glasses with different main oxide contents. Signals in the FT-IR are mainly observed around 500 cm ﹣1 , 720 cm ﹣1 , 840 cm ﹣1 , 980 - 1080 cm ﹣1 , and 1200 - 1500 cm ﹣1 , while the Raman scattering peaks are located at 130 cm ﹣1 , 390 cm ﹣1 , 575 cm ﹣1 , 920 cm ﹣1 , and 1250 cm ﹣1 . The glasses are mainly structured around [BO 3 ] units and the numbers of [BiO 6 ] and [BiO 3 ] units increase with the Bi 2 O 3 content increasing. Concurrently, the FT-IR absorption peaks associated with [BO 4 ] units shift to lower wave numbers, indicating a loosening of the glass structure. However, as the B 2 O 3 content is increased, the numbers of [BO 3 ] and [BO 4 ] units increase, while those of [BiO 3 ] and [BiO 6 ] units decrease, highlighting a densification of the glass structure. ZnO acts as a network modifier in these glasses.