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Local stabilisation of polar order at charged antiphase boundaries in antiferroelectric (Bi0.85Nd0.15)(Ti0.1Fe0.9)O3

Author(s): Ian MacLaren | LiQiu Wang | Owen Morris | Alan J. Craven | Robert L. Stamps | Bernhard Schaffer | Quentin M. Ramasse | Shu Miao | Kambiz Kalantari | Iasmi Sterianou | Ian M. Reaney

Journal: APL Materials
ISSN 2166-532X

Volume: 1;
Issue: 2;
Start page: 021102;
Date: 2013;
Original page

Observation of an unusual, negatively-charged antiphase boundary in (Bi0.85Nd0.15)(Ti0.1Fe0.9)O3 is reported. Aberration corrected scanning transmission electron microscopy is used to establish the full three dimensional structure of this boundary including O-ion positions to ∼±10 pm. The charged antiphase boundary stabilises tetragonally distorted regions with a strong polar ordering to either side of the boundary, with a characteristic length scale determined by the excess charge trapped at the boundary. Far away from the boundary the crystal relaxes into the well-known Nd-stabilised antiferroelectric phase.
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