Novel Nanorod Precipitate Formation in Neodymium and Titanium Codoped Bismuth Ferrite
Novel Nanorod Precipitate Formation in Neodymium and Titanium Codoped Bismuth Ferrite
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DOI：
10.1002/adfm.201201835
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发表时间：
2013-02-11
影响因子：
19
通讯作者：
Reaney, Ian M.
中科院分区：
文献类型：
--
作者：
MacLaren, Ian;Wang, Li Qiu;Reaney, Ian M.
报道了在掺钕和钛的铁酸铋中发现了不寻常的纳米棒沉淀。纳米棒的原子结构和化学性质是使用高角环形暗场成像、电子能量损失谱和密度泛函计算的组合来确定的。据发现，强烈修改的BiFeO 3基体的结构相邻的沉淀物;准备BiFeO 3采取不同的结构同素异形体反过来解释了为什么这么大的轴比，不常见的沉淀物，是稳定的。此外，相关性被发现之间的对齐的杆和铁弹域在矩阵中的方向，这是一致的系统的尝试，以尽量减少其内部应变。密度泛函计算表明，有限密度的电子状态在费米能量内的棒，这表明增强的导电性沿着棒轴，并激励未来的研究纳米棒的功能。
The discovery of unusual nanorod precipitates in bismuth ferrite doped with Nd and Ti is reported. The atomic structure and chemistry of the nanorods are determined using a combination of high angle annular dark field imaging, electron energy loss spectroscopy, and density functional calculations. It is found that the structure of the BiFeO3 matrix is strongly modified adjacent to the precipitates; the readiness of BiFeO3 to adopt different structural allotropes in turn explains why such a large axial ratio, uncommon in precipitates, is stabilized. In addition, a correlation is found between the alignment of the rods and the orientation of ferroelastic domains in the matrix, which is consistent with the system's attempt to minimize its internal strain. Density functional calculations indicate a finite density of electronic states at the Fermi energy within the rods, suggesting enhanced electrical conductivity along the rod axes, and motivating future investigations of nanorod functionalities.