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Issue 13, 2018
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Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3

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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 Pnma′. 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.

Graphical abstract: Superexchange-mediated negative thermal expansion in Nd-doped BiFeO3

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Publication details

The article was received on 13 Nov 2017, accepted on 14 Dec 2017 and first published on 14 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC05175A
Citation: 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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