Effect of Li2O substitution for Na2O on the solubility and water durability of Mo in aluminoborosilicate glass

摘要

Abstract The effect of substitution of Li2O for Na2O on the solubility, crystallization of Mo in an aluminoborosilicate glass, and their aqueous durability were investigated. The results show that the substitution of Li2O for Na2O improves the depolymerization degree of the glass network by transferring part of [4]Al to [5]Al and [6]Al. When the Na2O is all replaced by Li2O, the solubility of Mo in the glass reaches 5 mol%. From the structural analysis, with the increase of the solubility of Mo in the glass, the depolymerization degree of the glass and the average modified cations field strength in the depolymerization region are also increased. After 28 days, the normalized leaching rates of Mo and B of all samples are about ~10−4 g·m−2·d−1 and ~10−3 g·m−2·d−1, respectively, and the normalized leaching rates of Mo decrease with the substitution of Li2O for Na2O. The results provide researchers and engineers with a potential way to improve the solubility of Mo in nuclear waste glasses.