The structural consequences of charge disproportionation in mixed-valence iron oxides. II. The crystal and magnetic structures of BaLaFe2O5.91 at 5 K

P. D. Battle, T. C. Gibb*, P. Lightfoot, M. Matsuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

The crystal structure of the low temperature antiferromagnetic phase of the cubic perovskite BaLa Fe2O5.91 has been refined from neutron powder diffraction data collected at 5 K. Space groupPm-3m, a = 3.9268(1)Å.The magnetic structure is consistent with a simple G-type antiferromagnetism but with an unusually low average magnetic moment of 1.87 μB per Fe atom. An interpretation of the structural and magnetic data is proposed in terms of a charge disproportionation and the simultaneous formation of a charge density wave and a spin density wave, but without any structural distortion. The spin system is envisaged as a random arrangement of cations, nominally Fe3+ and Fe5+ in a 3:1 ratio, with antiferromagnetic coupling between pairs of like atoms, and ferromagnetic coupling between unlike atoms. The compound can thus be described as a Mattis spin glass.

Original languageEnglish
Pages (from-to)38-43
Number of pages6
JournalJournal of Solid State Chemistry
Volume85
Issue number1
DOIs
Publication statusPublished - 1 Jan 1990

Fingerprint

Dive into the research topics of 'The structural consequences of charge disproportionation in mixed-valence iron oxides. II. The crystal and magnetic structures of BaLaFe2O5.91 at 5 K'. Together they form a unique fingerprint.

Cite this