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Chemical durability and conductivity of mixed borosilicate glasses for high level waste immobilisation
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Islam, M. M., Holland, D. and Scales, C. R.. (2008) Chemical durability and conductivity of mixed borosilicate glasses for high level waste immobilisation. European Journal of Glass Science and Techology. Part B. Physics and Chemistry of Glasses, Vol.49 (No.5). pp. 229-236. ISSN 1753-3562
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Abstract
Glasses of nominal composition xMeO.(100-x)MW have been prepared, where MW is the mixed alkali borosilicate glass system used for high level waste immobilisation; Me=the divalent cations Ca, Sr, Ba, Mn, Zn and Pb; and 2.4 <= x <= 15 mol%. Their chemical durability has been determined using an international standard soxhlet leach test procedure and ionic conductivity has been measured using ac impedance. The durability tests showed that the alkaline earth oxides BaO, SrO and CaO decrease the durability, whilst ZnO and PbO improve the corrosion resistance. The presence of a surface Mn7SiO12 crystalline phase was identified on corroded MnO containing glasses. The ionic conductivity of the base glass (MW) at 300 degrees C was found to be 0.93 +/- 0.01 mu S cm(-1) and this decreased on addition of the oxides, with 12 mol% PbO reducing conductivity by a factor >20. The activation energy for dc conductivity is in the range 0.40 to 0.59 +/- 0.03 eV, typical of alkali ion motion, and shows some dependence on the fraction of 4-coordinated borons, N-4, in the glasses.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
| Divisions: | Faculty of Science > Physics |
| Journal or Publication Title: | European Journal of Glass Science and Techology. Part B. Physics and Chemistry of Glasses |
| Publisher: | Society of Glass Technology |
| ISSN: | 1753-3562 |
| Date: | October 2008 |
| Volume: | Vol.49 |
| Number: | No.5 |
| Number of Pages: | 8 |
| Page Range: | pp. 229-236 |
| Status: | Not Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| URI: | http://wrap.warwick.ac.uk/id/eprint/29060 |
Data sourced from Thomson Reuters' Web of Knowledge
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