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The effect of Cs2O additions on HLW wasteform glasses

Research output: Contribution to journalJournal articlepeer-review

Published
  • B.G. Parkinson
  • D. Holland
  • M.E. Smith
  • A.P. Howes
  • C.R. Scales
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<mark>Journal publication date</mark>1/09/2005
<mark>Journal</mark>Journal of Non-Crystalline Solids
Issue number30-32
Volume351
Number of pages8
Pages (from-to)2425-2432
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Physical parameters and structural characteristics are reported for the mixed alkali borosilicate glass system, xCs2O(100 - x)(MW) (0 ≤ x ≤ 9.66) where MW is the BNFL wasteform glass (10.29 mol% Li2O, 10.53 mol% Na2O, 18.57 mol% B2O3, 60.61 mol% SiO2). Glass density was found to increase with x whilst the glass transition temperature (Tg) decreased. The fraction of four-coordinated boron (N4) 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 Q4 (B) and Q3 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% Cs2O and a correlation was found between the amount of Q3 units in the solid and the volatilization loss from the melt. © 2005 Elsevier B.V. All rights reserved.