Issue 13, 2018

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 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

Supplementary files

Article information

Article type
Paper
Submitted
13 ное 2017
Accepted
14 дек 2017
First published
14 дек 2017

J. Mater. Chem. C, 2018,6, 3260-3270

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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