摘要
采用高分辨透射电子显微镜(HR-TEM)与球差校正电镜高角环形暗场(HAADF)像研究了层状钙钛矿La_(0.9)Sr_(0.1)TiO_(3+δ)(LST)的显微结构,揭示了该材料体系中存在的氧空位缺陷对晶格结构的作用机制.结果表明:材料晶格结构受缺氧环境的影响会引起LST晶胞a,b轴长度的缩短与c轴的相对伸长,在整体上表现为晶胞的体积收缩.基于高分辨显微像与Z衬度原子像的分析,能够识别由氧空位引发的部分原子面重排以及由连续晶格畸变所导致的位错现象.氧空位缺陷的有效调控将对优化材料微观结构,进一步制备高反射率钙钛矿材料具有重要意义.
The microstructure of layer perovskite La_(0.9)Sr_(0.1)TiO_(3+δ) was investigated by high-resolution transmission electron microscopy and high angle annular dark field image analysis.The mechanism of oxygen vacancy on the lattice structure was revealed.Based on the results by X-ray diffraction,the oxygen-difficient environment effect on the lattice structure leads to the change of axial length and volume contraction in the material.The partial atomic plane rearrangement and dislocation caused by oxygen vacancy and continuous lattice distortion are identified based on high-resolution microscopic and Z-contrast atomic images,respectively.The effective regulation of oxygen vacancy defect shows a great significance on changing the microstructure of materials and further preparation of high-performance perovskite materials.
作者
赵阳
朱锦鹏
王海龙
邵刚
杨凯军
马壮
高丽红
舒永春
何季麟
ZHAO Yang;ZHU Jinpeng;WANG Hailong;SHAO Gang;YANG Kaijun;MA Zhuang;GAO Lihong;SHU Yongchun;HE Jilin(Henan Province Industrial Technology Research Institute of Resources and Materials,Zhengzhou University,Zhengzhou 450001,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China;National Key Laboratory of Science and Technology on Materials under Shock and Impact,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2021年第4期633-638,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金青年项目(52002355)
装备预研重点实验室基金项目(6142902200202)
中国博士后面上基金(2019M652569)。
关键词
层状钙钛矿
氧空位
显微结构
高角环形暗场像
layer perovskite
oxygen vacancy
microstructure
high angle annular dark field
