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Rietveld refinement of the crystal structures of hexagonal Y6Cr4+xAl43−x (x=2.57) and tetragonal YCr4−xAl8+x (x=1.22)

Published online by Cambridge University Press:  10 January 2013

R. Černý ,
K. Yvon ,
T. I. Yanson ,
M. B. Manyako  and
O. I. Bodak
R. Černý
Affiliation:
Laboratoire de Cristallographie, Université de Genève, 24, quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
K. Yvon
Affiliation:
Laboratoire de Cristallographie, Université de Genève, 24, quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
T. I. Yanson
Affiliation:
Department of Inorganic Chemistry, L‘viv University, 6, Lomonosova street, 290005 L'viv 5, Ukraine
M. B. Manyako
Affiliation:
Department of Inorganic Chemistry, L‘viv University, 6, Lomonosova street, 290005 L'viv 5, Ukraine
O. I. Bodak
Affiliation:
Department of Inorganic Chemistry, L‘viv University, 6, Lomonosova street, 290005 L'viv 5, Ukraine
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Abstract

Y6Cr4+xAl43−x (x = 2.57); space group P63/mcm, a = 10.8601(1) Å, c = 17.6783(3) Å, V= 1805.7(1) Å3, Z=2; isostructural to Yb6Cr4+xAl43−x, (x=1.76) with two aluminium sites partially occupied by chromium (44% and 27% Cr). YCr4−xAl8+x (x=1.22); space group I4/mmm, a = 9.0299(2) Å, c = 5.1208(2) Å, V=417.55(3) Å3, Z=2, disordered variant of CeMn4Al8 with one chromium site (8f) partially occupied by aluminium (33% Al); X-ray powder diffraction data were collected on a well-crystallized multiphase sample containing 43 wt.% of Y6Cr4+xAl43−x, 27 wt.% of Y2Cr8−xAl16+x, 16 wt.% of Al, 13 wt.% of YAl3, and traces of Y2O3. Structure refinement converged at Rwp = 2.0% and RB = 3.5, 3.6% resp. for a total of 78 parameters and 1190 reflections.

Keywords

powder diffractionRietveld refinementintermetallic phase
Type
Research Article
Information
Powder Diffraction , Volume 10 , Issue 2 , June 1995 , pp. 86 - 90
Copyright
Copyright © Cambridge University Press 1995

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