Structural Properties of Strontium Vanadate Glasses

Structural studies of the strontium vanadate glasses of compositionsxV₂O₅–(100 −x)SrO are reported. X-ray diffractograms, density, and oxygen molar volume, etc., of the glasses show that single-phase and homogeneous glasses were obtained in the composition domainx= 50 to 90 mol%. The network structure for the glass compositions with 90 and 80 mol% V₂O₅is built up of the VO₅polyhedra, while the other glass compositions consist of the VO₄polyhedra. Density and glass transition temperature are observed to decrease with an increase in the V₂O₅content. The magnetic susceptibility of the glasses shows an increase of concentration of the reduced V⁴⁺ion with the increase of vanadium oxide content in the compositions. The well-resolved electron spin resonance structure observed for the glass composition with 50 mol% V₂O₅gradually becomes poor and reduces to a single component line, which has been attributed to the increase of the hopping rate of charge carriers with the increase of the V₂O₅content in the compositions.