Authors: Michaelis, Vladimir K.; Kroeker, Scott

Source: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Volume 50, Number 4, August 2009 , pp. 249-252(4)

Publisher: Society of Glass Technology

Abstract:

The evaporation of Cs from caesium borosilicate glasses with variable melting times has been quantified using inductively coupled plasma optical emission spectroscopy and ¹³³Cs NMR spin echo intensities. Caesium is shown to be lost as an oxide or in elemental form, not as a borate or silicate compound. The composition change is associated with a decrease in the fraction of four-coordinated boron, as measured by ¹¹B MAS NMR, and regular changes in the ¹³³Cs NMR peak position. Distinct behaviour of the two tetrahedral boron NMR peaks suggests that some degree of phase separation may also occur after long heating times. These results on a simplified model for a nuclear waste glass show that NMR can play a role in determining structural changes due to elemental volatility, and provide valuable information on which solutions to this problem may be based.

Document Type: Research article

Publication date: 2009-08-01

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