INVESTIGATION OF METAMICT AND ANNEALED NATURAL PYROCHLORES BY X-RAY ABSORPTION SPECTROSCOPY.

R. B. Greegor, F. W. Lytle, B. C. Chakoumakos, G. R. Lumpkin, R. C. Ewing

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

15 Scopus citations

Abstract

The pyrochlore structure type is a common phase in polycrystalline waste forms. A principal concern has been the effect of alpha-recoil events on the long-term 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 x-ray diffraction amorphous (the metamict state). X-ray absorption spectroscopy is used to investigate the coordination geometry of Ti-sites in metamict and annealed pyrochlores. The principal effects in the fully-damaged material compared to annealed samples include an increase in the asymmetry of the Ti-site and a slight reduction in bond length and coordination number.

Original languageEnglish
Title of host publicationMaterials Research Society Symposia Proceedings
EditorsCarol M. Jantzen, John A. Stone, Rodney C. Ewing
PublisherMaterials Research Soc
Pages655-662
Number of pages8
ISBN (Print)093183709X
StatePublished - 1985
Externally publishedYes

Publication series

NameMaterials Research Society Symposia Proceedings
Volume44
ISSN (Print)0272-9172

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