Effect of barium oxide on structural features and thermal properties of vanadium phosphate glasses

Abstract

Novel vanadyl-phosphate glasses with nominal compositions (0.25–0.5y) Bi2O3 – yBaO - (0.75–0.5y) (0.5P2O5-0.5V2O5) (0 ≤ y ≤ 0.30) have been synthesized using melt-quenching method. X-Ray Diffraction (XRD) studies proved that the batch of samples have amorphous nature. The parameters density, molar volume and oxygen packing density (OPD) were calculated and it is observed that density varies between 3.359 and 3.803 (g/cm3) and molar volume changes with density this is due to formation and modification of Non Bridging Oxygens (NBO). The packing density values and the ion concentration increased in parallel with increasing content of BaO. It is found that BaO is the component that contributes most to increase the thermal stability of the glasses, the Fourier-transform infrared (FTIR) spectrometry measurement FTIR spectroscopy reveals that the incorporation of V2O5 decreases the intensity of all the characteristic bands of the phosphate chain.