Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3
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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.
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
Journal of Materials Chemistry C
© 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
DescriptionWe 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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