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

被引：30
作者：
Reaney, Ian M. [1 ]
MacLaren, Ian [2 ]
Wang, Liqiu [2 ]
Schaffer, Bernhard [2 ,3 ]
Craven, Alan [2 ]
Kalantari, Kambiz [1 ]
Sterianou, Iasmi [1 ]
Miao, Shu [1 ]
Karimi, Sarah [1 ]
Sinclair, Derek C. [1 ]
机构：
[1] Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England
[2] Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow G12 8QQ, Lanark, Scotland
[3] SuperSTEM Lab, Warrington WA4 4AD, Cheshire, England
来源：
APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 18期
基金：
英国工程与自然科学研究理事会;
关键词：
BISMUTH FERRITE; CERAMICS; CONDUCTIVITY; BIFEO3;
D O I：
10.1063/1.4705431
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 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 (similar to 1%) to 1/3V(Nd)''' at higher concentrations (>1%) results in a decrease in the magnitude of Delta T-C/Delta x, as the disruption of long range anti-polar coupling declines. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4705431]
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页数：3
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