Abstract
Physical parameters and structural characteristics are reported for the mixed alkali borosilicate glass system, xCs 2O(100 − x)(MW) (0 ⩽ x ⩽ 9.66) where MW is the BNFL wasteform glass (10.29 mol% Li 2O, 10.53 mol% Na 2O, 18.57 mol% B 2O 3, 60.61 mol% SiO 2). Glass density was found to increase with x whilst the glass transition temperature ( T g) decreased. The fraction of four-coordinated boron (N 4) determined from 11B magic angle spinning nuclear magnetic resonance (MAS NMR) increased with x in a manner consistent with previous reports on the sodium–lithium–borosilicate system and contrary to the Dell model. 29Si MAS NMR was used to identify the fraction of Q 4 (B) and Q 3 units as a function of x. Raman spectra indicated the presence of reedmergnerite and danburite superstructural units. Mass loss measurements showed a non-linear variation with x, having a maximum between 7 and 8 mol% Cs 2O and a correlation was found between the amount of Q 3 units in the solid and the volatilization loss from the melt.
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