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Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3

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Christopher Matthew Kavanagh, Philip Lightfoot, Finlay D. Morrison

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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.
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Original languageEnglish
Pages (from-to)3260-3270
JournalJournal of Materials Chemistry C
Volume6
Issue number13
Early online date14 Dec 2017
DOIs
Publication statusPublished - 7 Apr 2018

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