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 Bi<sub>0.85</sub>Nd<sub>0.15</sub>Fe<sub>0.9</sub>Ti<sub>0.1</sub>O<sub>3</sub> ceramics contain coherent Nd-rich precipitates distributed throughout the perovskite lattice, implying charge compensation is obtained by the creation of V<sub>Nd</sub><sup>///</sup> and not V<sub>Bi</sub><sup>///</sup>. At low concentrations, therefore, Ti<sub>4+</sub> replace Fe<sub>2+</sub> with the creation of 2/3V<sub>Nd</sub><sup>///</sup>, and at higher concentrations (when Fe<sub>2+</sub> have been eliminated and the conductivity suppressed), Fe<sub>3+</sub> with the creation of 1/3V<sub>Nd</sub><sup>///</sup>. The switch in ionic compensation mechanism from 2/3V<sub>Nd</sub><sup>///</sup> at low Ti concentrations (∼1%) to 1/3V<sub>Nd</sub><sup>///</sup> 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:Wang, Ms Liqiu and Schaffer, Dr Bernhard and MacLaren, Dr Ian 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