Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3

Christopher M. Kavanagh; Philip Lightfoot; Finlay D. Morrison

doi:10.1039/C7TC05175A

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Superexchange-mediated negative thermal expansion in Nd-doped BiFeO₃†‡

Christopher M. Kavanagh,^a Philip Lightfoot

^a and Finlay D. Morrison

*^a

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* Corresponding authors

^a School of Chemistry and EaStCHEM, University of St Andrews, St Andrews, UK
E-mail: finlay.morrison@st-andrews.ac.uk

Abstract

A detailed powder neutron diffraction study of Bi_0.7Nd_0.3FeO₃ shows it is a G_z-type antiferromagnet adopting the space group Pn′ma′. Detailed structural analysis using both Rietveld and symmetry mode analysis indicates that competition between geometric effects and magnetic superexchange results in unusual evolution of octahedral tilting and structural distortion on cooling. These changes are manifested in both the electrical response, which displays relaxor-type behaviour, and also in a region of negative thermal expansion below 200 K.

This article is part of the themed collection: Advances in Solid State Chemistry and its Applications

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Article information

DOI: https://doi.org/10.1039/C7TC05175A
Article type: Paper
Submitted: 13 Nov 2017
Accepted: 14 Dec 2017
First published: 14 Dec 2017

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J. Mater. Chem. C, 2018,6, 3260-3270

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Superexchange-mediated negative thermal expansion in Nd-doped BiFeO₃

C. M. Kavanagh, P. Lightfoot and F. D. Morrison, J. Mater. Chem. C, 2018, 6, 3260 DOI: 10.1039/C7TC05175A

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Journal of Materials Chemistry C