Strain driven structural phase transformations in dysprosium doped BiFeO3 ceramics

Lennox, Robert Christopher, Price, Mark C., Jamieson, W., Jura, M., Daoud-Aladine, A., Murray, C.A., Tang, C., Arnold, Donna C. (2014) Strain driven structural phase transformations in dysprosium doped BiFeO3 ceramics. Journal of Materials Chemistry C, 2 (17). pp. 3345-3360. ISSN 2050 7534. E-ISSN 2050-7526. (doi:10.1039/c3tc32345e) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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http://dx.doi.org/10.1039/c3tc32345e

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.

Item Type: Article
DOI/Identification number: 10.1039/c3tc32345e
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Mater. Chem. C [Field not mapped to EPrints] AD - School of Physical Sciences, University of Kent, Canterbury Kent CT2 7NH, United Kingdom [Field not mapped to EPrints] AD - ISIS Facility, Rutherford Appleton Laboratory-STFC Chilton, Didcot Oxfordshire OX11 0QX, United Kingdom [Field not mapped to EPrints] AD - Diamond Light Source, Ltd., Harwell Science and Innovation Campus, Didcot Oxfordshire OX11 0DE, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: A-site cations, Electrical measurement, Ferromagnetic character, Phase co-existence, Pnma symmetry, Size mismatch, Structural phase transformations, Synchrotron diffraction study, Bismuth compounds, Ceramic materials, Iron oxides, Dysprosium
Subjects: Q Science > QC Physics > QC176 Solid state physics
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 07 Jul 2015 11:09 UTC
Last Modified: 29 May 2019 14:43 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49054 (The current URI for this page, for reference purposes)
Arnold, Donna C.: https://orcid.org/0000-0003-0239-5790
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