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Rietveld refinement of YbCoO3 prepared from aqueous solution-gel precursor

Published online by Cambridge University Press:  01 March 2012

L. Ben Farhat ,
R. Ben Hassen  and
L. Dammak
L. Ben Farhat
Affiliation:
Unité de Recherche de Chimie des Matériaux, ISSBAT, Université de Tunis ElManar 9, Avenue Dr. Zoheir Safi, 1006 Tunis, Tunisia
R. Ben Hassen
Affiliation:
Unité de Recherche de Chimie des Matériaux, ISSBAT, Université de Tunis ElManar 9, Avenue Dr. Zoheir Safi, 1006 Tunis, Tunisia
L. Dammak
Affiliation:
LMEI, Universite Paris XII, 61, Avenue du Général de Gaulle, 94010 Créteil, France
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Abstract

A polycrystalline sample of YbCoO3 was prepared using a water-soluble complex method at relatively low temperatures. Common chelating ligands such as citric acid were employed for the synthesis of complex-based precursors, followed by thermal decomposition of the precursors at high temperatures. X-ray diffraction data were collected and the crystal structure was refined by the Rietveld method. The structure of YbCoO3 can be described as a sesquioxide C-M2O3-like structure with space group Ia-3 and unit-cell parameter a=10.4470 (2). The Yb3+ and the Co3+ cations are found to preferentially occupy the two nonequivalent 8d and 24d sites, respectively. The two independent atoms Yb/Co have octahedral coordination; however, the degrees of distortion of their coordination polyhedron are different. The relationship between the title compound and the orthorhombic Perovskite structure of YbCoO3 reported in the literature is established.

Keywords

sesquioxidessol-gelX-ray diffractionRietveld method
Type
Technical Articles
Information
Powder Diffraction , Volume 22 , Issue 1 , March 2007 , pp. 35 - 39
Copyright
Copyright © Cambridge University Press 2007

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