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The Effects of Na2O, Al2O3, and 3203 ON HfO2 Solubility in Borosilicate Glass

Published online by Cambridge University Press:  10 February 2011

L. L. Davis ,
L. Li ,
G. Darab ,
H. Li ,
D. Strachan ,
P. G. Allen ,
J. J. Bucher ,
I. M. Craig ,
N. M. Edelstein  and
D. K. Shuh
L. L. Davis
Affiliation:
Pacific Northwest National Laboratory, Box 999, Richland, WA 99352;
L. Li
Affiliation:
Pacific Northwest National Laboratory, Box 999, Richland, WA 99352;
G. Darab
Affiliation:
Pacific Northwest National Laboratory, Box 999, Richland, WA 99352;
H. Li
Affiliation:
Pacific Northwest National Laboratory, Box 999, Richland, WA 99352;
D. Strachan
Affiliation:
Pacific Northwest National Laboratory, Box 999, Richland, WA 99352;
P. G. Allen
Affiliation:
MS 70A-1 150, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
J. J. Bucher
Affiliation:
MS 70A-1 150, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
I. M. Craig
Affiliation:
MS 70A-1 150, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
N. M. Edelstein
Affiliation:
MS 70A-1 150, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
D. K. Shuh
Affiliation:
MS 70A-1 150, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
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Abstract

A single borosilicate glass composition has previously been shown to dissolve 10 and 25 mass% PuO2 under oxidizing and reducing conditions, respectively. A simplified version of this glass has been thoroughly investigated to determine the effect of increasing the alkali:aluminum ratio on the HfO2 solubility in borosilicate glasses. We are investigating HfO2 solubility because specific Pu wastes are being considered for disposal in glass, and Hf(IV) serves as a structural surrogate for Pu(IV) and as a neutron absorber in glass. Three series of base glasses were produced using the same initial composition, but varying the oxides B2O3, Al2O3, or Na2O one at a time. In a fourth series of the same initial composition, both Na2O and A12O3 were varied. Hafnia was added to these glasses and the mixture equilibrated for 2 hours: 1 hour at 1450°C after 1 hour at 1560°C. A wide range of HfO2 additions were made to the base glasses, and the solubility of HfO2 determined to within ±1 mass%. The highest solubility determined was 14 mol% (35 mass%) HfO2 in a low-Al glass. We conclude that increasing Na2O/Al2O3 increases the HfO2 solubility, and increasing the B2O3 content apparently has little effect on HfO2 solubility in the borosilicate glasses studied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 313
Copyright
Copyright © Materials Research Society 1999

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