UNSPECIFIED (2004) Chemical durability studies of waste-simulant doped borosilicate glasses. In: 27th Symposium on Scientific Basis for Nuclear Waste Management, JUN 15-19, 2003, Kalmar, SWEDEN.

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Abstract

A mixed-alkali modified borosilicate base glass used in the vitrification of high-level nuclear waste (HLW) has been doped with a number of waste simulants to between 2 and 12 mol%. The simulants have been chosen to give two distinct series of glasses: one consisting of trivalent ions having the form M2O3 (where M is La, Bi, Al or Fe) and the other consisting of divalent simulants of the form MO (where M is Pb, Zn or Ba). An international standard Soxhlet leach test procedure was performed on each glass to study the effect of prolonged, moderate-temperature, dynamic water corrosion. Results of these studies show that, except for BaO, as the amount of simulant is increased, the amount of Na and Li leached decreases showing them to become more chemically resistant. These corrosion tests have been correlated to ionic (D.C.) conductivity measurements, which show a decrease in the conductivity of the glass as the amount of waste simulant is increased, and B-11 magic-angle spinning nuclear magnetic resonance (MAS-NMR) studies, which have shown that, as more waste-simulant is loaded into the glasses the rate of conversion of [BO4] to [BO3] units increases. All of the data from these studies reflect the different network forming abilities of the divalent and trivalent cations.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Series Name:	MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS
Journal or Publication Title:	SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXVII
Publisher:	MATERIALS RESEARCH SOCIETY
ISBN:	1-55899-752-0
ISSN:	0272-9172
Editor:	Oversby, VM and Werme, LO
Date:	2004
Volume:	807
Number of Pages:	6
Page Range:	pp. 145-150
Publication Status:	Published
Title of Event:	27th Symposium on Scientific Basis for Nuclear Waste Management
Location of Event:	Kalmar, SWEDEN
Date(s) of Event:	JUN 15-19, 2003
URI:	http://wrap.warwick.ac.uk/id/eprint/34148

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