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Issue 17, 2014
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Strain driven structural phase transformations in dysprosium doped BiFeO3 ceramics

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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

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Publication details

The article was received on 27 Nov 2013, accepted on 07 Jan 2014 and first published on 14 Jan 2014


Article type: Paper
DOI: 10.1039/C3TC32345E
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Citation: J. Mater. Chem. C, 2014,2, 3345-3360

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    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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