Issue 18, 2012
From the journal:

CrystEngComm

Growth and characterization of large high quality brownmillerite CaFeO2.5 single crystals†

Monica Ceretti,ab   Andrea Piovano,cd   Alain Cousson,e   Tanguy Berthier,bc   Martin Meven,f   Giovanni Agostini,c   Jurg Schefer,g   Olivier Hernandez,b   Carlo Lambertic  and  Werner Paulus*ab  

* Corresponding authors

a University of Montpellier 2, UMR 5253, ICGM, C2M, CC1504, 5 Place Eugène Batallion, Montpellier, France
E-mail: werner.paulus@univ-montp2.fr

b Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes1, Inorganic Materials: Soft Chemistry and Reactivity of Solids, Bât. 10B, Campus de Beaulieu, Rennes, France

c Department of Chemistry, NIS Center of Excellence, and INSTM unit, University of Turin, Via Giuria 7, Turin, Italy

d Institut Laue-Langevin (ILL), BP 156 X, Grenoble Cedex, France

e LLB, CEA/Saclay, Gif-sur-Yvette cedex, France

f TU-München, FRM-II, München, Germany

g Laboratory for Neutron Scattering Paul Scherrer Institut, Villigen PSI, Switzerland

Abstract

The growth conditions of large and high quality single-crystals of CaFeO2.5 by the floating-zone technique in an image furnace are discussed. Structural characterization of the as grown single crystals have been carried out by neutron and X-ray diffraction as well as by HRTEM revealed the excellent quality in terms of composition homogeneity and crystalline quality. Magnetic measurements have been performed on oriented crystals by SQUID and neutron diffraction in the range of 5–700 K in order to clear up controversial discussions on possible magnetic phase transitions. The magnetic transitions reported elsewhere are discussed in terms of oxygen non-stoichiometries leading to multiphase CaFeO2.5±δ related to the crystal growth conditions.

Graphical abstract: Growth and characterization of large high quality brownmillerite CaFeO2.5 single crystals

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Article information

DOI
https://doi.org/10.1039/C2CE25413A
Article type
Paper
Submitted
22 Mar 2012
Accepted
02 May 2012
First published
03 May 2012

CrystEngComm, 2012,14, 5771-5776

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Growth and characterization of large high quality brownmillerite CaFeO2.5 single crystals

M. Ceretti, A. Piovano, A. Cousson, T. Berthier, M. Meven, G. Agostini, J. Schefer, O. Hernandez, C. Lamberti and W. Paulus, CrystEngComm, 2012, 14, 5771 DOI: 10.1039/C2CE25413A

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