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Strain driven structural phase transformations in dysprosium doped BiFeO3 ceramics

DOI: 10.1039/c3tc32345e DOI Help

Authors: Donna Arnold (University of Kent) , Mark Price (University of Kent) , Robert Lennox (University of Kent) , William Jamieson (STFC) , Marek Jura (STFC) , Aziz Daoud-aladine (STFC) , Claire Murray (Diamond Light Source) , Chiu Tang (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry C

State: Published (Approved)
Published: January 2014

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.

Journal Keywords: Dy3+ Into Bifeo3 Multiferroic Materials Pnma Symmetries

Subject Areas: Materials, Physics

Instruments: I11-High Resolution Powder Diffraction