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Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3

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Kavanagh_NTE_Nd_BFO.pdf (3.979Mb)
Date
07/04/2018
Author
Kavanagh, Christopher Matthew
Lightfoot, Philip
Morrison, Finlay D.
Keywords
QD Chemistry
DAS
BDC
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Abstract
A detailed powder neutron diffraction study of Bi0.7Nd0.3FeO3 shows it is a Gz-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 relaxer-type behaviour, and also in a region of negative thermal expansion below 200 K.
Citation
Kavanagh , C M , Lightfoot , P & Morrison , F D 2018 , ' Superexchange-mediated negative thermal expansion in Nd-doped BiFeO 3 ' , Journal of Materials Chemistry C , vol. 6 , no. 13 , pp. 3260-3270 . https://doi.org/10.1039/C7TC05175A
Publication
Journal of Materials Chemistry C
Status
Peer reviewed
DOI
https://doi.org/10.1039/C7TC05175A
ISSN
2050-7526
Type
Journal article
Rights
© 2017 the Authors. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/ 10.1039/C7TC05175A
Description
We thank the Science and Technology Facilities Council for access to the ISIS neutron facility (RB1210111). CMK would like to thank the EPSRC for provision of a studentship via the doctoral training grant (EP/K503162/1).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/16684

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