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Phase relationships and crystallography of annealed alloys in the Ce5Si4-Ce5Ge4 pseudobinary system

TitlePhase relationships and crystallography of annealed alloys in the Ce5Si4-Ce5Ge4 pseudobinary system
Publication TypeJournal Article
Year of Publication2009
AuthorsZhang H, Mudryk Y, Zou M, Pecharsky VK, Gschneidner KA, Long Y
Journal TitleJournal of Alloys and Compounds
Volume487
Pages98-102
Date Published11/13
ISBN Number0925-8388
Accession NumberISI:000272521900026
Keywordsce5ge4, ce5si4, ce5si4-ce5ge4 pseudobinary system, crystal structure, crystal-structure, GD5SI4-GD5GE4, phase diagram, rare earth compounds, silicon
Abstract

The phase relationships of annealed alloys in the Ce5Si4-xGex system were determined by X-ray powder diffraction (XRD). Two structurally distinct terminal phase regions were observed in this system: the Ce5Si4-based solid solution (0 <= x < 2.85) crystallizing in the Zr(5)si(4)-type tetragonal structure with space group P4(1)2(1)2, and the Ce5Ge4-based solid solution (3.35 < x <= 4) crystallizing in the Sm5Ge4-type orthorhombic structure with space group Prima. An intermediate phase, which has a narrow composition range with the monoclinic Gd5Si2Ge2-type structure, space group P112(1)/a, was found to exist at x=2.95 +/- 0.05. The Rietveld powder diffraction profile fitting technique was used to refine the crystal structures, lattice parameters, and the atomic positions. The phase relationships of the Ce5Si4-xGex pseudobinary system after heat treatment were established from these data. (C) 2009 Elsevier B.V. All rights reserved.
URL<Go to ISI>://000272521900026
DOI10.1016/J.Jallcom.2009.07.131