Structure of UC2 and U2C3:XRD, 13C NMR and EXAFS study

Carvajal Nuñez , R. and Prieur and Eloirdi, R. and Prieur, D. and Martel, L. and Lopez Honorato, E. and Farnan, I. and Vitova, T. and Somers, J. (2014) Structure of UC2 and U2C3:XRD, 13C NMR and EXAFS study. Journal of Alloys and Compounds, 589. pp. 234-239. ISSN ISSN: 0925-8388 DOI 10.1016/j.jallcom.2013.11.202

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Abstract

In this study, uranium dicarbide (UC2) has been prepared by arc melting and heat treated under vacuum to form uranium sequicarbide (U2C3) in the presence of a second phase UC2-z. Both samples, as cast and heat treated, have been characterised by chemical analyses, X-ray diffraction (XRD), 13C magic angle spinning nuclear magnetic resonance (MAS-NMR) and by extended X-ray absorption fine structure (EXAFS). The composition, the purity, the various environments of both U and C atoms as well as the bonds length with the coordination number have been determined. By combining a long-range order method (XRD) and short-range order spectroscopy techniques (EXAFS and NMR), a unique view on the microstructure of UC2, before and after heat treatment, and of U2C3 phase has been achieved.

Item Type: Article
Uncontrolled Keywords: 2013AREP; IA66;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Alloys and Compounds
Volume: 589
Page Range: pp. 234-239
Identification Number: 10.1016/j.jallcom.2013.11.202
Depositing User: Sarah Humbert
Date Deposited: 13 Feb 2014 11:15
Last Modified: 18 Feb 2014 17:27
URI: http://eprints.esc.cam.ac.uk/id/eprint/2958

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