Defect chemistry of Ti-doped antiferroelectric Bi0.85Nd0.15FeO3
Defect chemistry of Ti-doped antiferroelectric Bi0.85Nd0.15FeO3
复制标题
DOI：
10.1063/1.4705431
复制
发表时间：
2012-05
影响因子：
4
通讯作者：
I. Reaney;I. MacLaren;Liqiu Wang;B. Schaffer;A. Craven;K. Kalantari;I. Sterianou;S. Miao;S. Karimi;D. Sinclair
中科院分区：
文献类型：
--
作者：
I. Reaney;I. MacLaren;Liqiu Wang;B. Schaffer;A. Craven;K. Kalantari;I. Sterianou;S. Miao;S. Karimi;D. Sinclair
像差校正的扫描透射电子显微镜显示，Bi 0.85 Nd 0.15 Fe 0.9 Ti 0.1 O3陶瓷包含分布在整个钙钛矿晶格中的相干富Nd沉淀物，这意味着通过创建VNd/而不是VBi/来获得电荷补偿。因此，在低浓度下，Ti 4+取代Fe 2+，产生2/3VNd/，在较高浓度下（当Fe 2+被消除且导电性被抑制时），Fe 3+产生1/3VNd/。离子补偿机制从低Ti浓度（<1%）的2/3VNd/切换到较高浓度（>1%）的1/3VNd/，导致ΔTC/Δx的幅度降低，因为长程反极性耦合的破坏下降。
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.