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

被引：8

作者：

Nunez, U. Carvajal ^{[1
]}

Eloirdi, R. ^{[1
]}

Prieur, D. ^{[1
]}

Martel, L. ^{[1
]}

Lopez Honorato, E. ^{[2
]}

Farnan, I. ^{[3
]}

Vitova, T. ^{[4
]}

Somers, J. ^{[1
]}

机构：

[1] European Commiss, Joint Res Ctr, Inst Transuranium Elements, D-76125 Karlsruhe, Germany

[2] CINVESTAV, IPN, Ctr Invest & Estudios Avanzados, Ramos Arizpe 25900, Coahuila, Mexico

[3] Univ Cambridge, Cambridge CB2 1TN, England

[4] Inst Nukl Entsorgung, D-76021 Karlsruhe, Germany

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 589卷

关键词：

NMR; EXAFS; XRD; Carbides; Uranium; Nuclear Fuel; SOLID-STATE NMR; URANIUM MONOCARBIDE; CHEMICAL-SHIFT; X-RAY; CARBIDES; FUEL; IRRADIATION; MECHANISM; REACTORS; KINETICS;

D O I：

10.1016/j.jallcom.2013.11.202

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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), C-13 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. (C) 2013 Elsevier B. V. All rights reserved.

引用

页码：234 / 239

页数：6

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