Glass formation and glass structure of BiO_1.5–CuO–Ca_0.5Sr_0.5O system

Abstract

The glass-forming region of the BiO1.5–CuO–Ca0.5Sr0.5O system has been determined by melting 5 g batches. Glass rods 4 mm in diameter and 75 mm long have been made. The glass transition temperatures (TG) and the onset crystallization temperatures (Tx) are around 390 °C and 440 °C, respectively. Densities of these glasses range from 5.5 to 7.0 g/cm3. The glass structure consists of the [BiO3] and [BiO6] units, and the conversion between these two polyhedra mainly depends on the Ca0.5Sr0.5O amount. The molecular volume of the glasses indicated that increasing Ca0.5Sr0.5O caused loose glass structures.

Role of Bi2O3 content on physical, optical and vibrational studies in Bi2O3–ZnO–B2O3 glasses

“…This is confirmed from the fact that in the present glasses, the band observed at 696-720 cm −1 in infrared spectra is assigned to B-O-B bending vibrations in [BO 3 ] triangles [39] while the strong bands in the range 1258 cm −1 and 1319 cm −1 arises from Bi-O − stretching vibrations of BiO 3 units. The band in the present IR spectra around 855 cm −1 represents the convolution of the absorbance bands reported for different bismuthate glasses at 840 cm −1 and 860 cm −1 , assigned to the total symmetric stretching vibrations of the [BiO 3 ] and [BiO 6 ] polyhedra, respectively [40,41]. In the present study this band is observed at 900 cm −1 which increases in intensity and shifts to 966 cm −1 as Bi 2 O 3 content is increased from 45 mol% to 70 mol%.…”

Vibrational spectra and structure of bismuth based quaternary glasses

“…This is confirmed from the fact that in the present glasses, the band observed at 696-720 cm −1 in infrared spectra is assigned to B-O-B bending vibrations in [BO 3 ] triangles [24] while the strong bands in the range 1258 cm −1 and 1319 cm −1 arises from B-O − stretching vibrations of orthoborate and pyroborate in BO 3 units [25]. The IR band in around 855 cm −1 represents the convolution of the absorbance bands reported for different bismuthate glasses at 840 cm −1 and 860 cm −1 , assigned to the total symmetric stretching vibrations of the [BiO 3 ] and [BiO 6 ] polyhedra, respectively [26,27]. The infrared spectral range of 900-950 cm −1 is typical for the stretching vibrations of [BO 4 ] units [28].…”

Effect of Bi2O3 on structure and wetting studies of Bi2O3–ZnO–B2O3 glasses

“…The weak band at ∼520 cm −1 is due to v 4 vibration of [BO 4 ] tetrahedral [15] [20,21]. The band at ∼1270 cm −1 is due to Bi-O − stretching vibrations of [BiO 3 ] triangles [9,16,18], and the band at ∼1520 cm −1 is due to asymmetrical stretching of [BiO 3 ] triangles [18].…”