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Epitaxial growth of perovskite oxide films facilitated by oxygen vacancies
Journal of Materials Chemistry C ( IF 6.4 ) Pub Date : 2020-12-30 , DOI: 10.1039/d0tc05750a
M. Tyunina 1, 2, 3, 4, 5 , L. L. Rusevich 6, 7, 8, 9 , E. A. Kotomin 6, 7, 8, 9, 10 , O. Pacherova 11, 12, 13 , T. Kocourek 11, 12, 13 , A. Dejneka 11, 12, 13
Affiliation  

Single-crystal epitaxial films of technologically important and scientifically intriguing multifunctional ABO3 perovskite-type metal oxides are essential for advanced applications and understanding of these materials. In such films, a film-substrate misfit strain enables unprecedented crystal phases and unique properties that are not available in their bulk counterparts. However, the prerequisite growth of strained epitaxial films is fundamentally restricted by misfit relaxation. Here we demonstrate that introduction of a small oxygen deficiency concurrently stabilizes epitaxy and increases lattice strain in thin films of archetypal perovskite oxide SrTiO3. By combining experimental and theoretical methods, we found that lattice distortions around oxygen vacancies lead to anisotropic local stresses, which interact with the misfit strain in epitaxial films. Consequently, specific crystallographic alignments of the stresses are energetically favorable and can facilitate epitaxial growth of strained films. Because anisotropic oxygen-vacancy stresses are inherent to perovskite-type and many other oxides, we anticipate that the disclosed phenomenon of epitaxial stabilization by oxygen vacancies is relevant for a very broad range of functional oxides.

中文翻译:

氧空位促进钙钛矿氧化物薄膜的外延生长

具有技术重要性和科学吸引力的多功能ABO 3钙钛矿型金属氧化物的单晶外延膜对于高级应用和对这些材料的理解至关重要。在此类薄膜中,薄膜-基材失配应变可实现前所未有的晶相和独特的性能,而这些是其他同类产品所不具备的。但是,应变外延膜的必要生长基本上受到失配松弛的限制。在这里,我们证明了少量缺氧的引入同时稳定了外延生长并增加了原型钙钛矿氧化物SrTiO 3薄膜的晶格应变。。通过结合实验和理论方法,我们发现氧空位周围的晶格畸变导致各向异性局部应力,其与外延膜中的失配应变相互作用。因此,应力的特定晶体学取向在能量上是有利的,并且可以促进应变膜的外延生长。由于各向异性的氧空位应力是钙钛矿型氧化物和许多其他氧化物固有的,因此我们预计,所公开的氧空位外延稳定现象与非常广泛的功能性氧化物有关。
更新日期:2021-01-11
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