Defect chemistry of Ti-doped antiferroelectric Bi_0.85Nd_0.15FeO₃

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 Bi_0.85Nd_0.15FeO₃. Applied Physics Letters, 100(18), p. 182902. (doi: 10.1063/1.4705431)

Abstract

Aberration corrected scanning transmission electron microscopy revealed that Bi_0.85Nd_0.15Fe_0.9Ti_0.1O₃ ceramics contain coherent Nd-rich precipitates distributed throughout the perovskite lattice, implying charge compensation is obtained by the creation of V_Nd^/// and not V_Bi^///. At low concentrations, therefore, Ti₄₊ replace Fe₂₊ with the creation of 2/3V_Nd^///, and at higher concentrations (when Fe₂₊ have been eliminated and the conductivity suppressed), Fe₃₊ with the creation of 1/3V_Nd^///. The switch in ionic compensation mechanism from 2/3V_Nd^/// at low Ti concentrations (∼1%) to 1/3V_Nd^/// 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
• Status: Published
• Refereed: Yes
• 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: 0003-6951
• ISSN (Online): 1077-3118

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
53940	1	Using aberration corrected STEM to study the atomic structure of incommensurate antiferroelectrics	Ian Maclaren	Engineering & Physical Sciences Research Council (EPSRC)	EP/I000879/1	P&A - PHYSICS & ASTRONOMY