Title: A Study of Uranium-based Multilayers - I. Fabrication and Structural Characterization
Authors: SPRINGELL R.ZOCHOWKSI S. W.WARD R. C. C.WELLS M. R.BROWN S.BOUCHENOIRE L.WILHELM F.LANGRIDGE S.STIRLING W. G.LANDER G.h.
Citation: JOURNAL OF PHYSICS-CONDENSED MATTER vol. 20 p. 215229
Publisher: IOP PUBLISHING LTD
Publication Year: 2008
JRC N°: JRC45244
ISSN: 0953-8984
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC45244
DOI: 10.1088/0953-8984/20/21/215229
Type: Articles in Journals
Abstract: This paper addresses the structural characterization of a series of U/Fe, U/Co and U/Gd multilayers. X-ray reflectivity has been employed to investigate the layer thickness and roughness parameters along the growth direction and high angle diffraction measurements have been used to determine the crystal structure and orientation of the layers. For the case of uranium/transition metal systems, the interfaces are diffuse (~17 Å) and the transition metals are present in a polycrystalline form of their common bulk phases with a preferred orientation along the closest packed planes; Fe, bcc (110) and Co, hcp (00.1), respectively. The uranium is present in a poorly crystalline orthorhombic, a-U state. In contrast, the U/Gd multilayers have sharp interfaces with negligible intermixing of atomic species, and have a roughness, which is strongly dependent on the gadolinium layer thickness. Diffraction spectra indicate a high degree of crystallinity in both U and Gd layers with intensities consistent with the growth of a novel hcp U phase, stabilized by the hcp gadolinium layers.
JRC Institute:Institute for Transuranium Elements

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