Structural analysis of mixed transition metal ion doped barium-boro-bismuthate glass system

Abstract

Transition Metal Ion (TMI) doped barium-boro-bismuthate glasses with composition(10-x)V2O5-xMoO3-25BaO-20B2O3-45Bi2O3 (with x = 0, 1, 3, 5, and 8 mol%) were synthesized using melt quench technique. As synthesized and annealed (at 450°C for 5 hours) compositions were studied by analysing their physical and structural behaviour. The broad XRD profiles of as synthesized glasses confirmed the formation of glassy phase whereas the ordered profiles of annealed compositions depicted the formation of nano-crystalline Bi45BO69 phase (with crystallite size <50 nm) inside the glass matrix. Density of as prepared glass samples increase with increase in concentration of MoO3 at cost of V2O5. The presence of [BiO6], [BiO3], [BO3], and [BO4] structural units inside the glass matrix is depicted by FTIR and confirmed by Raman spectroscopy. The increase in calculated values of N4 indicating decrease in concentration of Non-Bridging Oxygen (NBO), on addition of MoO3. Increase in density and decrease in concentration of NBO, indicated contraction of size which agrees with compositional variation N4. The microstructure and elemental analysis for annealed glass samples typical (MVBBB(x = 0, 2 and 5)) were investigated using FESEM/ EDX technique. The recorded FESEM micrographs of annealed samples, shows crystalline growth at annealed temperature and agrees with XRD analysis.