The atomic structure and chemistry of Fe-rich steps on antiphase boundaries in Ti-doped Bi0.9Nd0.15FeO3
The atomic structure and chemistry of Fe-rich steps on antiphase boundaries in Ti-doped Bi0.9Nd0.15FeO3
复制标题
DOI：
10.1063/1.4884684
复制
发表时间：
2014-06
期刊：
影响因子：
6.1
通讯作者：
I. MacLaren;Liqiu Wang;A. Craven;Q. Ramasse;B. Schaffer;K. Kalantari;I. Reaney
中科院分区：
文献类型：
--
作者：
I. MacLaren;Liqiu Wang;A. Craven;Q. Ramasse;B. Schaffer;K. Kalantari;I. Reaney
在ti掺杂的Bi0.85Nd0.15FeO3中经常观察到阶梯反相边界，这与最近报道的新型平面反相边界有关。这些步骤的原子结构和化学性质是由高角度环形暗场和明场扫描透射电子显微镜成像结合电子能量损失谱来确定的。这些步骤的核心由4个共享边的FeO6八面体组成。利用冻结声子多层成像方法进行图像模拟，证实了该结构。这些台阶也被发现带负电荷，就像之前研究的平面边界一样，导致周围钙钛矿基质的极化。
Stepped antiphase boundaries are frequently observed in Ti-doped Bi0.85Nd0.15FeO3, related to the novel planar antiphase boundaries reported recently. The atomic structure and chemistry of these steps are determined by a combination of high angle annular dark field and bright field scanning transmission electron microscopy imaging, together with electron energy loss spectroscopy. The core of these steps is found to consist of 4 edge-sharing FeO6 octahedra. The structure is confirmed by image simulations using a frozen phonon multislice approach. The steps are also found to be negatively charged and, like the planar boundaries studied previously, result in polarisation of the surrounding perovskite matrix.