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J. Korean Ceram. Soc. > Volume 58(2); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(2): 169-177.
doi: https://doi.org/10.1007/s43207-020-00080-7
Observation of fault-free coherent layer during Ruddlesden–Popper faults generation in LaNiO3 thin films
Jumi Bak, Sung-Yoon Chung
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
Correspondence  Sung-Yoon Chung ,Email: nalphates@icloud.com
Received: August 13, 2020; Revised: August 13, 2020   Accepted: September 1, 2020.  Published online: March 31, 2021.
ABSTRACT
Two-dimensional lattice defects, including surface and grain boundaries, in various perovskite oxides have garnered considerable attention, as the overall physical properties of the oxides can significantly vary depending on the atomic and electronic structure of the defects. In particular, because Ruddlesden–Popper (RP) planar faults have a unique lattice structure with [AO] monolayers being inserted in an ABO3 perovskite framework, they have attracted considerable attention, resulting in various relevant studies being conducted. This study focuses on the eff ect of lattice strain on formation of RP faults and on critical thickness in (001) epitaxial LaNiO3 thin-film fabrication through a sol–gel process. Atomic-scale direct observations identifies that a fault-free coherent buff er layer forms during the RP fault generation and its thickness varies depending on the strain exerted from the substrate. When DyScO3, the lattice mismatch of which is the largest, is used as a substrate, the critical thickness of the fault-free buff er layer remarkably reduces to a few unit cells. This work highlights the significance of direct observation to understand the defect formation in perovskite oxides.
Key words: Thin-film fabrication · Strain · Critical thickness · Perovskite oxides · Transmission electron microscopy
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