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

doi:10.3724/SP.J.1077.2012.00285

Journal of Inorganic Materials ›› 2012, Vol. 27 ›› Issue (3): 285-290.DOI: 10.3724/SP.J.1077.2012.00285

• Research Paper • Previous Articles Next Articles

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)

Abstract

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

CLC Number:

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

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