Microstructure and secondary phases in epitaxial LaBaCo_2O_(5.5 + δ) thin films

作     者：Jiangbo Lu Lu Lu Sheng Cheng Ming Liu Chunlin Jia 

作者机构：School of Electronic and Information Engineering & State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons Forschungszentrum Jülich GmbH 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2018年第34卷第2期

页      面：398-402页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51501143, 51202185 and 51390472) the National Basic Research Program of China (No. 2015CB654903) Fundamental Research Funds for the Central Universities, China Postdoctoral Science Foundation (No. 2015M572554) 

主　　题：Nano structure Faceted interfaces Secondary phase growth Epitaxial thin film Microstructure Aberration corrected scanning transmission electron microscopy 

摘      要：Aberration-corrected scanning transmission electron microscopy was employed to investigate the microstructures and secondary phases in LaBaCo2O5.5＋δ（LBCO） thin films grown on SrTiO3 （STO） substrates. The as-grown films showed an epitaxial growth on the substrates with atomically sharp interfaces and orientation relationships of [100]LBCO//[100]STO and （001）LBCO//（001）STO. Secondary phases were observed in the films, which strongly depended on the sample fabrication conditions. In the film prepared at a temperature of 900 ℃, nano-scale CoO pillars nucleated on the substrate, and grew along the [001] direction of the film. In the film grown at a temperature of 1000 ℃, isolated nano-scale C0304 particles appeared, which promoted the growth of {111 } twinning structures in the film. The orientation relationships and the interfaces between the secondary phases and the films were illustrated, and the growth mechanism of the film was discussed.