Magnetically driven dielectric and structural behavior in Bi0.5La0.5FeO3

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

doi:10.1021/cm302513q

Magnetically driven dielectric and structural behavior in Bi_0.5La_0.5FeO₃

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

Research output: Contribution to journal › Article › peer-review

Abstract

A detailed structural analysis of the antiferromagnetic (G_z-type) lanthanum doped bismuth ferrite - Bi_0.5La_0.5FeO₃ (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.

Original language	English
Pages (from-to)	4563-4571
Number of pages	9
Journal	Chemistry of Materials
Volume	24
Issue number	23
DOIs	https://doi.org/10.1021/cm302513q
Publication status	Published - 11 Dec 2012

Keywords

BiFeO3
Perovskite
Octahedral tilt
Magnetostriction
A-site displacement
Multiferroic
Dielectric

Access to Document

10.1021/cm302513q

BLFO_Kavanagh_revised
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
Accepted author manuscript, 1.56 MB

Cite this

@article{3a46723218d44b0e9003756200992a44,

title = "Magnetically driven dielectric and structural behavior in Bi0.5La0.5FeO3",

abstract = "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.",

keywords = "BiFeO3, Perovskite, Octahedral tilt, Magnetostriction, A-site displacement, Multiferroic, Dielectric",

author = "Kavanagh, {Christopher Matthew} and Goff, {Richard John} and Aziz Daoud-Aladine and Philip Lightfoot and Morrison, {Finlay D.}",

note = "The 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. ",

year = "2012",

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T1 - Magnetically driven dielectric and structural behavior in Bi0.5La0.5FeO3

AU - Kavanagh, Christopher Matthew

AU - Goff, Richard John

AU - Daoud-Aladine, Aziz

AU - Lightfoot, Philip

AU - Morrison, Finlay D.

N1 - The 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.

PY - 2012/12/11

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N2 - 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.

AB - 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.

KW - BiFeO3

KW - Perovskite

KW - Octahedral tilt

KW - Magnetostriction

KW - A-site displacement

KW - Multiferroic

KW - Dielectric

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JF - Chemistry of Materials

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