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Alteration of Microstructure of West Valley Glass by Heat Treatment

Published online by Cambridge University Press:  21 February 2011

A. C. Buechele ,
X. Feng ,
H. Gu  and
I. L. Pegg
A. C. Buechele
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
X. Feng
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
H. Gu
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
I. L. Pegg
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
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Extract

Samples of West Valley reference glass WVCM-59 were subjected to isothermal heat treatment according to a systematic schedule of time-temperature combinations. Phases crystallizing during heat treatment were analyzed and quantified using an SEM equipped with an energy dispersive x-ray detector and image processing and analyzing capabilities. Only small amounts of noble metals (e.g. Rh, Pd) and RuO2 were present in the as-melted glass, but these frequently serve as nucleation sites during heat treatment. Iron-group spinels containing Fe, Ni, Cr, and Mn in variable proportions were the most common phases observed, appearing in quantities up to 3.5 vol% in heat treated glass. The formation of a thoria-ceria phase occurred at temperatures of 900°C and below. Acmites formed at temperatures of 800°C and below. A lithium phosphate phase with a particularly interesting morphology developed after prolonged heat treatment at temperatures between 600–750°C. The same phase appeared in a range of glass compositions. However, canister cooling curves preclude such a phase in production glass. Furthermore, no such phase was found in actual canister-cooled glass.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 176: Symposium U – Scientific Basis for Nuclear Waste Management XIII , 1989 , 393
Copyright
Copyright © Materials Research Society 1990

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References

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