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An Investigation of Metamict And Annealed Natural Pyrochlores by XRAY Absorption Spectroscopy

Published online by Cambridge University Press:  26 February 2011

R. B. Greegor ,
F. W. Lytle ,
B. C. Chakoumakos ,
G. R. Lumpkin  and
R. C. Ewing
R. B. Greegor
Affiliation:
The Boeing Company, Seattle, WA 98124
F. W. Lytle
Affiliation:
The Boeing Company, Seattle, WA 98124
B. C. Chakoumakos
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, NM 87131
G. R. Lumpkin
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, NM 87131
R. C. Ewing
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, NM 87131
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Abstract

The pyrochlore structure type, A1−2 B2 O6 Y0−1, is a common phase in polycrystalline waste forms. A principal concern has been the effect of alpharecoil events on the longterm stability of these phases. Naturally occurring minerals of the pyrochlore group provide an example of the full range of radiation effects from fully crystalline to xray diffraction amorphous (the metamict state). Xray absorption spectroscopy is used to investigate the coordination geometry of Tisites in metamict and annealed (1,000°C) pyrochlores. The principal effects in the fullydamaged material (∼4026 alpha events/m3) compared to annealed samples include an increase in the asymmetry of the Tisite and a slight reduction in bond length and coordination number.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 44: Symposium N – Scientific Basis for Nuclear Waste Management VIII , 1984 , 655
Copyright
Copyright © Materials Research Society 1985

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