Effect of small mobile cations on molybdenum borate glasses

Abstract

Lithium borate glasses modified with molybdenum oxide according to the formula: xMoO3(1-x)[0.25 Li2O 0.75 B2O3] prepared by the melt quenching technique were studied.Density, differential thermal analysis, FTIR and impedance spectroscopic were used toanalyze these systems. It was confirmed that the glassy matrix of these systems was basedon the MoO6 octahedral units and on BO3 and BO4 units. The results explained how thestability of a borate matrix that hosted molybdenum ions was affected by the presenceof small mobile ions (lithium ions in the present case). It was found that concentration ofmolybdenum oxide was restricted by strong interactions between the charged molybdenumstructures and the mobile ions due to the presence of order forces that promote the formation of crystalline structures.