Crystallization of bismuth borate glasses

Abstract

Bismuth borate glasses with Bi(2)O(3) concentration of 20-66 mol% were prepared by melt quenching and devitrified by heat treatment above their glass transition temperatures. All glasses show a strong tendency towards crystallization on annealing that increases with Bi(2)O(3) concentration. The crystalline phases formed on devitrification were characterized by FTIR absorption spectroscopy and DSC measurements. Our studies reveal that phases produced in glasses are strongly determined by initial glass composition and the two most stable crystalline phases are: Bi(3)B(5)O(12) and Bi(4)B(2)O(9). The metastable BiBO(3) phase can also be formed by devitrification of glass with 50 mol% of Bi(2)O(3). This phase is, however, unstable and decomposes into Bi(3)B(5)O(12) and Bi(4)B(2)O(9) on prolonged heat treatment.

Effect of Stepwise Replacement of Non-Oxide to Oxide Group on Structural Properties ofBi2O3·LiF·B2<

“…Intensity of this band increases with increase in Bi 2 O 3 concentration. It may be due to the Bi-O and Bi-O-Bi bonds in BiO 6 octahedra [20,21,[23][24][25].…”

From Structure to Luminescent Properties of B2O3-Bi2O3-SrF2 Glass and Glass-Ceramics Doped with Eu3+ Ions

“…The modifier that allows very good optical properties of borate glasses to be obtained is bismuth oxide. Borate-bismuth glasses are characterized by high density and high refractive indices and, importantly due to their preparation, are glasses with a comparatively low melting point in a wide glass formation range (20–80 mol % Bi 2 O 3 ) [ 11 ]. The choice of bismuth oxide over lead oxide, which has often been used in glasses in recent years, seems particularly good, as it breaks down the toxic material while leaving the glass with the desired properties.…”

DSC and DC Conductivity of Bi2O3 · LiF · B2O3 Glasses

“…Li et al [12] has also reported two glass transitions in some metallic glasses. Bajaj and Khanna [13] has reported two separate phases in some crystallized bismuth borate glasses. In case of glasses containing two alkali species, mixed alkali effect has also been claimed [14] with the help of two-stage relaxation mechanism.…”