UNSPECIFIED (2000) Characterisation and radiation resistance of a mixed alkali borosilicate glass for high level waste vitrification. In: 3rd International Conference on Borate Glasses, Crystals and Melts: Structure and Applications, JUL 04-09, 2000, SOFIA, BULGARIA.

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Abstract

Glasses related to those used for the vitrification of high level waste (HLW) have been produced from the sodium lithium borosilicate system. Thermal and structural characteristics of these glasses have been measured for a wide range of boron oxide contents and for a range of alkali oxide to boron oxide ratios R, for several fixed silica to boron oxide ratios, K. A series of glasses using the base borosilicate composition, with increasing additions of lanthanum oxide, was also prepared and analysed by the same methods. The mixed alkali borosilicate was seen to exhibit a maximum in glass transition temperature, T-g, and a minimum in the fraction of four coordinated borons, N-4, at 22 and 29 mol% boron oxide, respectively. Initial results indicate an increase in T-g to a maximum before a sharp decrease and subsequent levelling off at larger R. However: density measurements exhibited a maximum at the same value of R and then remained constant within experimental error at larger R. Initial a-particle irradiation tests have also been carried out on several base glass samples and show evidence of B(alpha, n) reactions, the occurrence of which could have important consequences for future use of the waste form.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QD Chemistry T Technology > TP Chemical technology
Journal or Publication Title:	PHYSICS AND CHEMISTRY OF GLASSES
Publisher:	SOC GLASS TECHNOLOGY
ISSN:	0031-9090
Date:	December 2000
Volume:	41
Number:	6
Number of Pages:	4
Page Range:	pp. 392-395
Publication Status:	Published
Title of Event:	3rd International Conference on Borate Glasses, Crystals and Melts: Structure and Applications
Location of Event:	SOFIA, BULGARIA
Date(s) of Event:	JUL 04-09, 2000
URI:	http://wrap.warwick.ac.uk/id/eprint/12478

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