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Characterization of Radiation Damage at the Nb Site in Natural Pyrochlores and Samarskites by X-Ray Absorption Spectroscopy

Published online by Cambridge University Press:  26 February 2011

R. B. Greegor ,
F. W. Lytle ,
B. C. Chakoumakos ,
G. R. Lumpkin ,
J. K. Warner  and
R. C. Ewing
R. B. Greegor
Affiliation:
Thc Boeing Company, Seattle, WA 98124
F. W. Lytle
Affiliation:
Thc 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
J. K. Warner
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

X-ray absorption spectroscopy has been used to investigate the Nb B-site in pyrochlores (A1.2B2O6Y0–1, Fd3m, Z=8) and samarskites (A3B5O16) in both metamict and annealed condition. The XANES and EXAFS measurements indicate significant changes in pyrochlore and smaller changes in samarskite as a result of radiation damage. In the metamict state the Nb site in both pyrochlores and samarskites is similar to Nb in Nb2O5. Short Nb-O (1.65Å) bonds are not disrupted by alpha-decay/recoil-nuclei events as much as longer bonds (2.00Å). This increases the asymmetry and static disorder at the local Nb site while long range order is greatly diminished resulting in considerable distribution in Nb-M distances and bond angles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 261
Copyright
Copyright © Materials Research Society 1989

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References

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