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Harecxs Measurements of Elemental Disordering

Published online by Cambridge University Press:  02 July 2020

Nestor J. Zaluzec  and
Katherine L. Smith
Nestor J. Zaluzec
Affiliation:
Materials Science Div., Argonne National Lab, Argonne, IL, USA
Katherine L. Smith
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, NSW, Australia;
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Abstract

It has been long known that orientation effects in crystalline materials can influence characteristic x-ray emission and microanalysis1-7. High Angular Resolution Electron Channeling X-ray Spectroscopy (HARECXS)6-7. a variation of ALCHEMI4-5, has been used at ANL for the last few years to investigate the effects of channeling on quantitative XEDS analysis of materials. More recently we have also been using HARECXS to carefully measure elemental disordering in a number of systems and have found that it can be used very successfully to elucidate the various stages of disorder.

Perovskite (nominally CaTiO3) is a host phase for actinides in various wasteforms for the immobilization of high level radioactive nuclear waste. Over geologic time, alpha decay damage of the actinides in perovskite will cause displacive effects that influence the dimensional and chemical stability of the wasteform. in the past, the progression of damage has been studied by monitoring changes in selected area electron diffraction (SAED) patterns with increasing dose (e.g. 11).

Type
Atom Location by Channeling Enhancement of X-Ray and EELS Signals (ALCHEMI)(organized by J.Spence)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 354 - 355
Copyright
Copyright © Microscopy Society of America 2001

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References

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12.) This work was supported in part by the US. DoE under BES-MS W-31-109-Eng-38 at ANL, and the Materials Science Program at ANSTO, additional travel support for NJZ by ANSTO is gratefully acknowledged.Google Scholar