Characterization of B-Site 1∶2 Ordering Structure for Ba(B′1/3B″2/3)O3 Perovskites Along <113>c Zone Axis by Transmission Electron Microscopy
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摘要: 提出了通过透射电子显微镜表征Ba(B′1/3B″2/3)O3钙钛矿(B′ = Zn2+、Mg2+、Co2+或Ni2+,B″ = Ta5+或Nb5+)B位1∶2有序结构时可采用的一个新的晶带轴(< 113>c),并首次研究了 < 113>c带轴下有序钙钛矿的原子架构. 在 < 113>c晶带轴下,选区电子衍射(SAED)中的±1/3{112}型超晶格斑点揭示了钙钛矿的1∶2有序结构. 对应的高分辨电子衍射(HRTEM)图像清楚地显示了有序畴的大小和原子结构. 高分辨图像中的成分衬度与原子结构非常匹配,进一步证实了沿 < 113>c带轴下的1∶2有序结构.Abstract: A new zone axis (< 113>c) has been provided to characterize the 1∶2 ordering structure of Ba(B′1/3B″2/3)O3 (B′ = Zn2+, Mg2+, Co2+ or Ni2+, B″ = Ta5+ or Nb5+) perovskite by transmission electron microscopic (TEM) observation, and the corresponding atomic architecture of ordered perovskites has also been studied firstly. The 1∶2 ordering structure was revealed by the ±1/3{112}-type superlattice spots in the selected area electron diffraction (SAED) pattern. The corresponding high resolution transmission electron microscopic (HRTEM) image clearly displayed the ordering domain size and atomic structure. The composition contrast in HRTEM image matched well with the atomic architecture, further confirmed the 1∶2 ordering structure along < 113>c zone axis.
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Key words:
- transmission electron microscopy /
- perovskite /
- crystal structure /
- ordering
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图 1 Ba(B′1/3B″2/3)O3钙钛矿的晶体结构(a) 无序排列,(b) 1∶2有序排列,示意图显示了沿不同投影的原子有序排列结构:<111>c、<110>c和<113>c
Figure 1. Crystal structure of (a) disordered and (b) 1∶2 ordered of Ba(B′1/3B″2/3)O3 perovskites Schematic diagrams showing the atomic architectures of ordered structure along different projections: <111>c, <110>c and <113>c
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