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Structural Alterations in Titanate Pyrochlores Induced by Ion Irradiation: Xray Photoelectron Spectrum Interpretation

Published online by Cambridge University Press:  21 March 2011

J. Chen ,
J. Lian ,
L. M. Wang ,
R. C. Ewing ,
J. Matt Farmer  and
L. A. Boatner
J. Chen
Affiliation:
Dept. of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109-2104, U.S.A.
J. Lian
Affiliation:
Dept. of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109-2104, U.S.A.
L. M. Wang
Affiliation:
Dept. of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109-2104, U.S.A.
R. C. Ewing
Affiliation:
Dept. of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109-2104, U.S.A.
J. Matt Farmer
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37831-6056, U.S.A.
L. A. Boatner
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37831-6056, U.S.A.
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Abstract

Titanate pyrochlores are candidate host materials for the disposition of plutonium from dismantled nuclear weapons. These pyrochlores also have potential applications as solid electrolytes and oxygen gas sensors. The radiation-induced microstructural evolution of titanate pyrochlores has been characterized using x-ray photoelectron spectroscopy (XPS). XPS analysis of the Ti 2p and O 1s binding energy shifts of REE2Ti2O7 (REE: rare earth) surface layers before and after irradiation shows that the primary manifestations of amorphization are distortions or changes in the coordination number of the titanium polyhedra. A model based on glass network structure was developed, and predictions of the relative susceptibilities for amorphization of the titanate pyrochlores are obtained that are consistent with the experimental results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ11.34
Copyright
Copyright © Materials Research Society 2002

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References

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