Issue 30, 2005

An unusual magnetic structure in Sr2FeO3F and magnetic structures of K2NiF4-type iron(iii) oxides and oxide halides, including the cobalt substituted series Sr2Fe1−xCoxO3Cl

Abstract

An unusual k = [½ ½ ½] magnetic structure is reported in Sr2FeO3F at low temperature. The magnetic structures of LaBaFeO4, LaSrFeO4, LaCaFeO4, Ca2FeO3Cl, Ca2FeO3Br, Sr2FeO3F, Sr2FeO3Cl, Sr2FeO3Br and solid solutions in the series Sr2Fe1−xCoxO3Cl have been examined and only Sr2FeO3F exhibits this structure. The La2CuO4-type spin arrangement dominates in all these phases, with antiferromagnetic ordering in the xy planes. The k = [½ ½ ½] magnetic phase in Sr2FeO3F occurs below 100 K and requires La2CuO4-type stacking across the SrO layers and La2NiO4-type stacking across the SrF layers. It has been possible to show that this phase grows in domains which have purely La2CuO4-type stacking at higher temperatures. In the Sr2Fe1−xCoxO3Cl series the La2CuO4-type magnetic structure in Sr2FeO3Cl and the La2NiO4-type structure in Sr2CoO3Cl coexist and structural and magnetic behaviour indicate phase segregation into cobalt- and iron-rich regions.

Graphical abstract: An unusual magnetic structure in Sr2FeO3F and magnetic structures of K2NiF4-type iron(iii) oxides and oxide halides, including the cobalt substituted series Sr2Fe1−xCoxO3Cl

Supplementary files

Article information

Article type
Paper
Submitted
21 Apr 2005
Accepted
01 Jun 2005
First published
16 Jun 2005

J. Mater. Chem., 2005,15, 3093-3103

An unusual magnetic structure in Sr2FeO3F and magnetic structures of K2NiF4-type iron(III) oxides and oxide halides, including the cobalt substituted series Sr2Fe1−xCoxO3Cl

A. L. Hector, C. S. Knee, A. I. MacDonald, D. J. Price and M. T. Weller, J. Mater. Chem., 2005, 15, 3093 DOI: 10.1039/B505617A

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