Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3

Christopher Matthew Kavanagh; Philip Lightfoot; Finlay D. Morrison

doi:10.1039/C7TC05175A

Superexchange-mediated negative thermal expansion in Nd-doped BiFeO₃

Christopher Matthew Kavanagh, Philip Lightfoot, Finlay D. Morrison^*

^*Corresponding author for this work

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

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 relaxer-type behaviour, and also in a region of negative thermal expansion below 200 K.

Original language	English
Pages (from-to)	3260-3270
Journal	Journal of Materials Chemistry C
Volume	6
Issue number	13
Early online date	14 Dec 2017
DOIs	https://doi.org/10.1039/C7TC05175A
Publication status	Published - 7 Apr 2018

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10.1039/C7TC05175A

Kavanagh_NTE_Nd-BFO
© 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
Accepted author manuscript, 3.98 MB

Finlay Morrison
- fm40st-andrews.acuk
- School of Chemistry - Professor
- EaSTCHEM
Person: Academic

Dataset underpinning: Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3
Kavanagh, C. M. (Contributor), Lightfoot, P. (Contributor) & Morrison, F. D. (Creator), University of St Andrews, 8 Jan 2018
DOI: 10.17630/cfd84657-908f-42c9-aad7-fb70b8583188
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title = "Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3",

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.",

author = "Kavanagh, {Christopher Matthew} and Philip Lightfoot and Morrison, {Finlay D.}",

note = "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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T1 - Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3

AU - Kavanagh, Christopher Matthew

AU - Lightfoot, Philip

AU - Morrison, Finlay D.

N1 - 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).

PY - 2018/4/7

Y1 - 2018/4/7

N2 - 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.

AB - 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.

U2 - 10.1039/C7TC05175A

DO - 10.1039/C7TC05175A

M3 - Article

SN - 2050-7526

VL - 6

SP - 3260

EP - 3270

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

IS - 13

ER -

Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3

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Dataset underpinning: Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3

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Superexchange-mediated negative thermal expansion in Nd-doped BiFeO₃