钛酸锶钡薄膜中微观结构缺陷及其形成机理

doi:10.3724/SP.J.1077.2012.00285

无机材料学报 ›› 2012, Vol. 27 ›› Issue (3): 285-290.DOI: 10.3724/SP.J.1077.2012.00285 CSTR: 32189.14.SP.J.1077.2012.00285

钛酸锶钡薄膜中微观结构缺陷及其形成机理

李春艳^{1, 2}, 刘雪华^{1, 2}, 刁飞玉¹, 梁文双², 王乙潜², PETROV Peter³, ALFORD Neil³

(1. 青岛大学化学化工与环境学院; 青岛 266071; 2. 青岛大学国家重点实验室培育基地, 青岛 266071; 3. Department of Materials, Imperial College London, London, SW7 2AZ, UK)

收稿日期:2011-03-31 修回日期:2011-05-04 出版日期:2012-03-20 网络出版日期:2012-02-16
作者简介:李春艳(1988-), 女, 硕士研究生. E-mail: bingchengwangzi_2006@126.com
基金资助:
国家自然科学基金(10974105); 山东省自然科学杰出青年基金(JQ201002); 青岛大学引进人才科研启动基金(06300701)

Microstructural Defects and Their Formation Mechanisms in Ba_0.75Sr_0.25TiO₃ Epitaxial Film

LI Chun-Yan^1,2, LIU Xue-Hua^1,2, DIAO Fei-Yu¹, LIANG Wen-Shuang², WANG Yi-Qian², PETROV Peter³, ALFORD Neil³

(1. College of Chemistry, Chemical Engineering and Environmental Engineering, Qingdao University, Qingdao 266071, China; 2. The Cultivation Base for State Key Laboratory, Qingdao University, 266071, China; 3. Department of Materials, Imperial College London, Exhibition Road, London, SW7 2AZ, UK)

Received:2011-03-31 Revised:2011-05-04 Published:2012-03-20 Online:2012-02-16
About author:LI Chun-Yan. E-mail: bingchengwangzi_2006@126.com
Supported by:
National Natural Science Foundation of China (10974105); Natural Science Foundation for Outstanding Young Scientists in Shandong Province, China (JQ201002); The Scientific Research Starting Foundation for the Introduced Talents at Qingdao University (06300701)

摘要/Abstract

摘要： 采用脉冲激光沉积方法, 在(001)单晶铝酸镧(LaAlO₃)衬底上成功制备出钛酸锶钡(Ba_0.75Sr_0.25TiO₃)外延薄膜. 利用高分辨电子显微学对其微观结构进行了详细研究, 并探讨了其微观结构缺陷的形成机理. 研究发现, 在钛酸锶钡外延薄膜中存在失配位错和穿透位错, 且存在直线型和锯齿型的两种反相畴界. 失配位错是由于钛酸锶钡薄膜与LaAlO₃单晶衬底之间存在较大的晶格失配形成的, 可分解为不全位错; 穿透位错可以分解为不全位错伴随有堆垛层错的形成. 反相畴界的形成是由于衬底表面存在台阶, 直线型反向畴界是由于形核点离台阶处较近产生的, 而锯齿型反向畴界是由于形核点离台阶处较远而形成. 研究结果可为其它钙钛矿型外延薄膜中微观结构缺陷的形成机理提供理论指导.

关键词: 钛酸锶钡外延薄膜, 高分辨透射电子显微学, 微观结构缺陷, 形成机理

Abstract: Ba_0.75Sr_0.25TiO₃ film was epitaxially grown on a (001) LaAlO₃ substrate using single-target pulsed laser deposition. The microstructure of the epitaxial film was investigated by high-resolution transmission electron microscope (HRTEM), and the formation mechanism of microstructural defects was explored. It was shown that misfit and threading dislocations existed in the epitaxial Ba_0.75Sr_0.25TiO₃ film. Apart from the dislocations, two different kinds of antiphase boundaries, straight and zig-zagged, were observed. For misfit dislocations, they were formed due to the lattice mismatch between LaAlO₃ and Ba_0.75Sr_0.25TiO₃ which could dissociate into several partial dislocations. For the threading dislocations, it was found that their dissociation usually coexists with stacking faults. The formation mechanism of the antiphase boundaries is attributed to the terrace or step on the surfaces of LaAlO₃substrate. If the nucleation site is just on the terrace, straight antiphase boundaries will be formed. However, if the nucleation site is not just on the terrace but a little far away from the terrace, zig-zagged antiphase boundaries will be produced. The results could shed light on the microstructural defects in other perovskite epitaxial films.

Key words: Ba_0.75Sr_0.25TiO₃ epitaxial film, high-resolution transmission electron microscopy, microstructural defects, formation mechanism

中图分类号:

李春艳, 刘雪华, 刁飞玉, 梁文双, 王乙潜, PETROV Peter, ALFORD Neil. 钛酸锶钡薄膜中微观结构缺陷及其形成机理[J]. 无机材料学报, 2012, 27(3): 285-290.

LI Chun-Yan, LIU Xue-Hua, DIAO Fei-Yu, LIANG Wen-Shuang, WANG Yi-Qian, PETROV Peter, ALFORD Neil. Microstructural Defects and Their Formation Mechanisms in Ba_0.75Sr_0.25TiO₃ Epitaxial Film[J]. Journal of Inorganic Materials, 2012, 27(3): 285-290.

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钛酸锶钡薄膜中微观结构缺陷及其形成机理

Microstructural Defects and Their Formation Mechanisms in Ba_0.75Sr_0.25TiO₃ Epitaxial Film

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钛酸锶钡薄膜中微观结构缺陷及其形成机理

Microstructural Defects and Their Formation Mechanisms in Ba0.75Sr0.25TiO3 Epitaxial Film

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Microstructural Defects and Their Formation Mechanisms in Ba_0.75Sr_0.25TiO₃ Epitaxial Film