Electron-Beam-Induced Formation of Oxygen Vacancies in Epitaxial LaCoO3 Thin Films

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters Pub Date : 2023-10-30 DOI:10.1007/s13391-023-00468-7

Seung Jo Yoo, Tae Gyu Yun, Jae Hyuck Jang, Ji-Hyun Lee, Changhyun Park, Sung-Yoon Chung

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Abstract

The formation of oxygen vacancies in heteroepitaxial LaCoO₃ thin films deposited on different substrates was investigated by using electron beam irradiation in atomic-scale scanning transmission electron microscopy (STEM). As the electron beam irradiation intensified, distinctive dark stripe patterns were identified in high-angle annular dark-field STEM images, demonstrating the formation and subsequent ordering of oxygen vacancies. A comprehensive quantitative analysis of the lattice parameter changes verified the significant expansion of unit cells associated with the presence of oxygen vacancies. In particular, a uniform distribution of these expanded unit cells was observed in the films under large tensile strain. These experimental findings emphasize the significant role of strain in generating oxygen vacancies in perovskite oxide materials.

Graphical Abstract

Abstract Image

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电子束诱导外延 LaCoO3 薄膜中氧空位的形成

在原子尺度扫描透射电子显微镜（STEM）中使用电子束辐照研究了沉积在不同基底上的异质外延钴氧化物薄膜中氧空位的形成。随着电子束辐照的增强，在高角度环形暗场 STEM 图像中发现了明显的深色条纹图案，证明了氧空位的形成和随后的有序化。对晶格参数变化的综合定量分析证实，氧空位的存在使单位晶胞显著扩大。特别是，在拉伸应变较大的薄膜中，观察到这些扩展单元的均匀分布。这些实验发现强调了应变在包晶氧化物材料中产生氧空位的重要作用。

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来源期刊

Electronic Materials Letters 工程技术-材料科学：综合

CiteScore

4.70

自引率

20.80%

发文量

审稿时长

2.3 months

期刊介绍： Electronic Materials Letters is an official journal of the Korean Institute of Metals and Materials. It is a peer-reviewed international journal publishing print and online version. It covers all disciplines of research and technology in electronic materials. Emphasis is placed on science, engineering and applications of advanced materials, including electronic, magnetic, optical, organic, electrochemical, mechanical, and nanoscale materials. The aspects of synthesis and processing include thin films, nanostructures, self assembly, and bulk, all related to thermodynamics, kinetics and/or modeling.