Defect chemistry of Ti-doped antiferroelectric Bi0.85Nd0.15FeO3

Reaney, I. M., MacLaren, I. , Wang, L., Schaffer, B., Craven, A., Kalantari, K., Sterianou, I., Miao, S., Karimi, S. and Sinclair, D. C. (2012) Defect chemistry of Ti-doped antiferroelectric Bi0.85Nd0.15FeO3. Applied Physics Letters, 100(18), p. 182902. (doi:10.1063/1.4705431)

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Aberration corrected scanning transmission electron microscopy revealed that Bi0.85Nd0.15Fe0.9Ti0.1O3 ceramics contain coherent Nd-rich precipitates distributed throughout the perovskite lattice, implying charge compensation is obtained by the creation of VNd/// and not VBi///. At low concentrations, therefore, Ti4+ replace Fe2+ with the creation of 2/3VNd///, and at higher concentrations (when Fe2+ have been eliminated and the conductivity suppressed), Fe3+ with the creation of 1/3VNd///. The switch in ionic compensation mechanism from 2/3VNd/// at low Ti concentrations (∼1%) to 1/3VNd/// at higher concentrations (>1%) results in a decrease in the magnitude of ΔTC/Δx, as the disruption of long range anti-polar coupling declines.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Schaffer, Dr Bernhard and MacLaren, Dr Ian and Wang, Ms Liqiu and Craven, Professor Alan
Authors: Reaney, I. M., MacLaren, I., Wang, L., Schaffer, B., Craven, A., Kalantari, K., Sterianou, I., Miao, S., Karimi, S., and Sinclair, D. C.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Applied Physics Letters
Publisher:American Institute of Physics
ISSN (Online):1077-3118

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
539401Using aberration corrected STEM to study the atomic structure of incommensurate antiferroelectricsIan MaclarenEngineering & Physical Sciences Research Council (EPSRC)EP/I000879/1P&A - PHYSICS & ASTRONOMY