Magnetically driven dielectric and structural behavior in Bi0.5La0.5FeO3
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A detailed structural analysis of the antiferromagnetic (Gz-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.
Kavanagh , C M , Goff , R J , Daoud-Aladine , A , Lightfoot , P & Morrison , F D 2012 , ' Magnetically driven dielectric and structural behavior in Bi 0.5 La 0.5 FeO 3 ' , Chemistry of Materials , vol. 24 , no. 23 , pp. 4563-4571 . https://doi.org/10.1021/cm302513q
Chemistry of Materials
Copyright © 2012 American Chemical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/cm302513q
DescriptionThe authors would like to thank the Royal Society for a University Research Fellowship (FDM), Engineering and Physical Sciences Research Council for a studentship (CMK), and the Science and Technology Facilities Council for access to neutron facilities.
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