Investigation of the arrangement of oxide ion vacancies and their effect on the crystal structure of BaFe0.9In0.1O3-δ
Investigation of the arrangement of oxide ion vacancies and their effect on the crystal structure of BaFe0.9In0.1O3-δ
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氧离子空位排列及其对BaFe0.9In0.1O3-δ晶体结构影响的研究
DOI：
10.1111/jace.16470
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发表时间：
2019
影响因子：
3.9
通讯作者：
Hashimoto Takuya
中科院分区：
文献类型：
--
作者：
Fujishiro Fumito;Sasaoka Chinatsu;Shibata Yusuke;Tsuda Kenji;Hashimoto Takuya
用高温X射线衍射法和原位聚束电子衍射法对在氮气中加热制备的BaFe0.9In0.1O3BFe010-N2BaFe0.9In0.1O3BFI010-N2BFI010-−δ的晶体结构进行了表征。当温度升高到700℃时，用原位CBED直接观察到立方钙钛矿空间群的对称性，表明BFI010-N2中氧离子空位的偏序和/或聚集消失，氧离子空位排列完全无序。晶体对称性的变化与氧离子传导活化能在600℃时的突然降低相一致。比较了在O2中加热制备的BaFe0.9In0.1O3BaFe0.9In0.1O3BaFe0.9In0.1O3BFI010-O2−δ样品的晶体对称性与BFI010-N2样品的晶体对称性进行了比较。结果表明，与温度升高引起的相变相似，δ的降低也发生了相同的相变。
The crystal structure of BaFe0.9In0.1O3−δ, which was prepared via heating in N2(BFI010‐N2), was evaluated using high‐temperature X‐ray diffraction (XRD) and in situ convergent‐beam electron diffraction (CBED) at room temperature and 700°C. Although the crystal structure of BFI010‐N2at room temperature was assigned to a cubic perovskite‐type structure based on the XRD results, the CBED patterns indicated that the space group of its crystal structure was not (No. 221), which corresponds to an ideal cubic perovskite. When the temperature was increased to 700°C, the symmetries for the space group of cubic perovskite were directly observed by means of in situ CBED, indicating that the partial ordering and/or clustering of oxide ion vacancies in the BFI010‐N2vanished and that the oxide ion vacancy arrangements became completely random. The change in crystal symmetry agreed with a sudden decrease in the activation energy of oxide ion conduction at 600°C. The crystal symmetry of the BaFe0.9In0.1O3−δsample that was prepared via heating in O2(BFI010‐O2) and had a decreasedδvalue was compared with that of the BFI010‐N2sample. It was concluded that the same phase transition also occurred by a decrease inδ, similar to phase transitions caused by increasing the temperature.