Structural roles of V and Mo in borate and silicate glasses by solid state NMR and Raman spectroscopies
Understanding the roles of vanadium and molybdenum in borosilicate glasses has attracted much attention in the development of high performance nuclear waste glasses with high waste loads. In such applications, the Na+ charge compensation mechanism is central in order to control poorly durable Mo-rich crystalline phases. Therefore, structural analyses of sodium borate and silicate glasses with the coexistence of vanadium and molybdenum have been performed. 11B and 29Si solid state NMR and Raman spectroscopies were applied to study the resulting structural changes of the glasses as a function of the V and Mo composition. For the borate glasses, the Na+ charge compensation mechanism was not influenced by the presence of V2O5 and MoO3. For the silicate glasses, vanadium was found to be an Na+ charge compensator in the absence of MoO3. For silicate glass containing MoO3, polymerisation of the glass containing 5 mol% V2O5 was lower than that of the glass containing 2 mol% V2O5. Apparently, the presence of vanadium in the glass containing 5 mol% V2O5 and 2 mol% MoO3 led to the formation of a sufficient number of positively charged units to compensate for MoO2– 4.
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Document Type: Research Article
Publication date: 01 October 2018