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Effects of Heat Treatment on the Microstructure of a Fully Simulated Nuclear Waste Glass

Published online by Cambridge University Press:  28 February 2011

Terese V. Palmiter ,
I. Joseph  and
L. David Pye
Terese V. Palmiter
Affiliation:
Institute of Glass Science and Engineering, New York State College of Ceramics at Alfred University, Alfred, NY.
I. Joseph
Affiliation:
Institute of Glass Science and Engineering, New York State College of Ceramics at Alfred University, Alfred, NY.
L. David Pye
Affiliation:
Institute of Glass Science and Engineering, New York State College of Ceramics at Alfred University, Alfred, NY.
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Abstract

Samples of a fully simulated nuclear waste glass under consideration for use in the West Valley Demonstration Project were isothermally heat treated and studied by scanning transmission electron microscopy (STEM). Both fully oxidized and partially reduced specimens were heat treated for 3 hours at 600°C, 700°C, 800°C and 900°C and for 45 days at 10°C above Tg (447°C -461°C) and at 10°C below TB (427°C -441°C). Microstructural features in untreated as well as the heat-treated glasses were studied using STEM. Analysis by energy dispersive spectroscopy (EDS) was used to identify the elemental compositions of the features observed.

The predominant crystalline phase present in the samples heat treated for 3 hours was an Fe3O4 type spinel with Ni and Cr substituting for some of the Fe. The spinels varied in size from 0.02 to 10.0 µm, the larger crystals present at higher heat-treatment temperatures. Long term heat treatment above Tg resulted in the formation of small iron-containing crystals ranging in size from 10 to 35 nm. Heat treatment below Tg produced no crystalline or amorphous phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 212: Symposium P – Scientific Basis for Nuclear Waste Management XIV , 1990 , 153
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

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