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Magnetically Driven Dielectric and Structural Behavior in Bi0.5La0.5FeO3

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Author(s)

Christopher Matthew Kavanagh, Richard John Goff, Aziz Daoud-Aladine, Philip Lightfoot, Finlay D. Morrison

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Abstract

A detailed structural analysis of the antiferromagnetic (G(z)-type) lanthanum doped bismuth ferrite - Bi0.5La0.5FeO3 (Pn'ma') - using variable-temperature powder neutron diffraction is reported. The analysis highlights a structural link between changes in the relative dielectric permittivity and changes in the FeO6 octahedral tilt magnitudes, accompanied by a structural distortion of the octahedra with corresponding A-site displacement along the c-axis; this behavior is unusual due to an increasing in-phase tilt mode with increasing temperature. The anomalous orthorhombic distortion is driven by magnetostriction at the onset of antiferromagnetic ordering resulting in an Invar effect along the magnetic c-axis and anisotropic displacement of the A-site Bi3+ and La3+ along the a-axis.

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Original languageEnglish
Pages (from-to)4563-4571
Number of pages9
JournalChemistry of Materials
Volume24
Issue number23
DOIs
Publication statusPublished - 11 Dec 2012

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