Abstract
Glass-ceramics were prepared based on the basic glass composition in mole fraction 0.65 Bi2O3 -0.35 SiO2 with replacements of 0.05 SiO2 by equivalent of one of the oxides: MoO3, WO3, SrO, BaO or CdO. The glass transition temperature of the parent glass is 465 degrees C which is observed to decrease when doped with Mo, W, Sr, Ba, or Cd oxides. A eulytite phase is formed through controlled crystallization of the parent glass-ceramic and the samples doped with Mo or W, while a Bi2O2SiO3 phase is detected for the samples doped with Sr and Cd. Orthorhombic bismuth silicate crystals were observed only in the sample doped with Ba. SEM images show that all samples have elongated particles with few rectangular or spherical crystals. BiO6 and BiO3 units are assumed to be formed in all samples within the characteristic IR silicate absorption bands.