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Gadolinium and Hafnium Alumino-Borosilicate Glasses: Gd and Hf Solubilities

Published online by Cambridge University Press:  10 February 2011

Donggao Zhao ,
L.L. Davis ,
Liyu Li ,
C.S. Palenik ,
L.M. Wang ,
D.M. Strachan  and
R.C. Ewing
Donggao Zhao
Affiliation:
Department of Nuclear Engineering and Radiological Sciences and Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-2104, dzhao@umich.edu
L.L. Davis
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999 (K6-24), Richland, Washington 99352
Liyu Li
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999 (K6-24), Richland, Washington 99352
C.S. Palenik
Affiliation:
Department of Nuclear Engineering and Radiological Sciences and Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-2104
L.M. Wang
Affiliation:
Department of Nuclear Engineering and Radiological Sciences and Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-2104
D.M. Strachan
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999 (K6-24), Richland, Washington 99352
R.C. Ewing
Affiliation:
Department of Nuclear Engineering and Radiological Sciences and Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-2104
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Abstract

The solubilities of Hf and Gd in sodium alumino-borosilicate glasses based on the target compositions were examined and confirmed by electron microprobe analysis. The measured compositions of essentially crystal-free glasses are generally homogeneous and close to the target compositions. Therefore, the solubilities of Gd and Hf in sodium alumino-borosilicate glasses based on the target glass compositions are valid. However, for glasses containing precipitates (crystals grown from the melt) and undissolved HfO2 with overgrowths, the chemical compositions are often heterogeneous and may be significantly different from the target compositions. Precipitated crystalline phases include a rare earth silicate with the apatite sructure (NaGd9(Si5.25B)O26) in a gadolinium sodium alumino-borosilicate glass and a HfO2 phase in hafnium sodium alumino-borosilicate glasses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 608: Symposium QQ – Scientific Basis for Nuclear Waste Management XXIII , 1999 , 683
Copyright
Copyright © Materials Research Society 2000

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References

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