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An Investigation of Uranium L-Edges of Metamict and Annealed Betafite

Published online by Cambridge University Press:  28 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, Washington 98124 USA
F. W. Lytle
Affiliation:
The Boeing Company, Seattle, Washington 98124 USA
B. C. Chakoumakos
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, New Mexico 87131 USA
G. R. Lumpkin
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, New Mexico 87131 USA
R. C. Ewing
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, New Mexico 87131 USA
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Abstract

The uranium site in naturally occurring metamict minerals of the pyrochlore group (A1–2B2O6Y0–1) has been investigated using x-ray absorption spectroscopy (XAS). Pyrochlore structures are common phases in proposed polycrystalline waste forms. Betafite, a member of the pyrochlore group (B = 2Ti ≥ Nb+Ta), exhibits U-O bond lengths of 1.94 and 2.37 A for the metamict state, and 2.03 and 2.51 A for the crystalline (annealed) state. The U-O bond lengths decrease (∼0.1 A) and there is a disruption in the second nearest neighbor periodicidy as material is converted from the crystalline to the metamict state.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 387
Copyright
Copyright © Materials Research Society 1985

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