Issue 17, 2014

Strain driven structural phase transformations in dysprosium doped BiFeO3 ceramics

Abstract

A detailed powder neutron and synchrotron diffraction study coupled with a complementary Raman spectroscopy study of the addition of Dy3+ into BiFeO3 ceramics is reported here. It can be seen that the addition of Dy3+ destabilises the polar R3c symmetry due to chemical strain effects arising from the large size mismatch between the two A-site cations (Dy3+ and Bi3+). This results in a lowering of the symmetry to a polar Cc model and in the range 0.05 ≤ x ≤ 0.30 in Bi1−xDyxFeO3 competition develops between the strained polar Cc and non-polar Pnma symmetries with the Cc model becoming increasingly strained until approximately x = 0.12 at which point the Pnma model becomes favoured. However, phase co-existence between the Cc and Pnma phases persists to x = 0.25. Preliminary magnetic measurements also suggest weak ferromagnetic character which increases in magnitude with increasing Dy3+ content. Preliminary electrical measurements suggest that whilst Bi0.95Dy0.05FeO3 is most likely polar; Bi0.70Dy0.30FeO3 shows relaxor-type behaviour.

Graphical abstract: Strain driven structural phase transformations in dysprosium doped BiFeO3 ceramics

Supplementary files

Article information

Article type
Paper
Submitted
27 Nov 2013
Accepted
07 Jan 2014
First published
14 Jan 2014

J. Mater. Chem. C, 2014,2, 3345-3360

Author version available

Strain driven structural phase transformations in dysprosium doped BiFeO3 ceramics

R. C. Lennox, M. C. Price, W. Jamieson, M. Jura, A. Daoud-Aladine, C. A. Murray, C. Tang and D. C. Arnold, J. Mater. Chem. C, 2014, 2, 3345 DOI: 10.1039/C3TC32345E

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