Structural properties of strontium vanadate glasses

Abstract

Structural studies of the strontium vanadate glasses of compositions xV₂O₅-(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 domain x=50 to 90 mol%. The network structure for the glass compositions with 90 and 80 mol% V₂O₅ is built up of the VO₅ polyhedra, while the other glass compositions consist of the VO₄ polyhedra. Density and glass transition temperature are observed to decrease with an increase in the V₂O₅ content. 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% V₂O₅ gradually 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 V₂O₅ content in the compositions.