Coexistence of rhombohedral and orthorhombic phases in ultrathin BiFeO3 films driven by interfacial oxygen octahedral coupling

CORC > 金属研究所 > 中国科学院金属研究所

	Coexistence of rhombohedral and orthorhombic phases in ultrathin BiFeO3 films driven by interfacial oxygen octahedral coupling
	Han, MJ; Wan, YJ; Ma, DS; Zhu, YL; Tang, YL; Liu, Y; Zhang, NB; Ma, JY; Ma, XL; Zhu, YL (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China.
刊名	ACTA MATERIALIA
	2018-02-15
卷号	145 页码:220-226
关键词	Thin-films Bismuth Ferrite Bright Field Unit-cell Transition Heterostructures Ferroelectricity Perovskites Distortions Anisotropy
ISSN号	1359-6454
英文摘要	Coexistence of two phases creates a morphotropic phase boundary in perovskite oxides, which can provide large piezoelectric response, generating it a well suited system for probe-based memories and actuator applications. The coexistence of two phases in thin films is proposed to be induced by epitaxial constraints from substrates or chemical compositional modifications by substitution. In this work, we found a new formation mechanism of two-phase coexistence driven by interfacial oxygen octahedral coupling (OOC) in oxide heterostructures. We fabricated a series of BiFeO3 (BFO) ultrathin films on various orthorhombic substrates exerting from tensile to compressive strains by Pulsed Laser Deposition (PLD) techniques. Aberration-corrected transmission electron microscopy demonstrates that the lattice rotation and oxygen octahedral rotation (OOR) patterns transfer from these substrates to BFO films in about 3 unit cells while an orthorhombic (Prima) phase forms at the interface due to OOC. This Prima phase is non-polar, which differs from polar phases of Ima2 or Pmc2(1) when a large tensile strain is imposed onto BFO. First-principles calculations reproduce these experimental results perfectly. This phase transition occurs when BFO films are under both tensile and compressive strains suggesting that OOC alone can induce phase transition in ultrathin BFO films. Such coexistence of two phases may have many potential applications in the field of electronics, such as ferroelectric sensors and actuators. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; Coexistence of two phases creates a morphotropic phase boundary in perovskite oxides, which can provide large piezoelectric response, generating it a well suited system for probe-based memories and actuator applications. The coexistence of two phases in thin films is proposed to be induced by epitaxial constraints from substrates or chemical compositional modifications by substitution. In this work, we found a new formation mechanism of two-phase coexistence driven by interfacial oxygen octahedral coupling (OOC) in oxide heterostructures. We fabricated a series of BiFeO3 (BFO) ultrathin films on various orthorhombic substrates exerting from tensile to compressive strains by Pulsed Laser Deposition (PLD) techniques. Aberration-corrected transmission electron microscopy demonstrates that the lattice rotation and oxygen octahedral rotation (OOR) patterns transfer from these substrates to BFO films in about 3 unit cells while an orthorhombic (Prima) phase forms at the interface due to OOC. This Prima phase is non-polar, which differs from polar phases of Ima2 or Pmc2(1) when a large tensile strain is imposed onto BFO. First-principles calculations reproduce these experimental results perfectly. This phase transition occurs when BFO films are under both tensile and compressive strains suggesting that OOC alone can induce phase transition in ultrathin BFO films. Such coexistence of two phases may have many potential applications in the field of electronics, such as ferroelectric sensors and actuators. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Natural Science Foundation of China [51571197, 51231007, 51501194, 51401212, 51671194]; National Basic Research Program of China [2014CB921002]; Key Research Program of Frontier Sciences CAS [QYZDJ-SSW-JSC010]; IMR SYNL-T.S. Ke Research Fellowship; Youth Innovation Promotion Association CAS [2016177]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79497]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhu, YL (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Han, MJ,Wan, YJ,Ma, DS,et al. Coexistence of rhombohedral and orthorhombic phases in ultrathin BiFeO3 films driven by interfacial oxygen octahedral coupling[J]. ACTA MATERIALIA,2018,145:220-226.
APA	Han, MJ.,Wan, YJ.,Ma, DS.,Zhu, YL.,Tang, YL.,...&Zhu, YL .(2018).Coexistence of rhombohedral and orthorhombic phases in ultrathin BiFeO3 films driven by interfacial oxygen octahedral coupling.ACTA MATERIALIA,145,220-226.
MLA	Han, MJ,et al."Coexistence of rhombohedral and orthorhombic phases in ultrathin BiFeO3 films driven by interfacial oxygen octahedral coupling".ACTA MATERIALIA 145(2018):220-226.