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

Hector, Andrew L., Knee, Christopher S., MacDonald, Alexander I., Price, Daniel J. and Weller, Mark T. (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. Journal of Materials Chemistry, 15 (30), 3093-3103. (doi:10.1039/b505617a).

Abstract

An unusual k = [1/2 1/2 1/2] 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 = [1/2 1/2 1/2] 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.

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Contributors

Author: Andrew L. Hector

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