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Oxygen vacancy enhanced ferroelectricity in BTO: SRO nanocomposite films

The enhancement of ferroelectric properties in lead-free ferroelectric is usually achieved by strain engineering. Here, we report a surprising polarization enhancement effect in an isostructural ferroelectric nanocomposite system composited by the ferroelectric material of BaTiO3 and metallic non-fe...

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Main Authors: Lin, Jun Liang (Author) , He, Ri (Author) , Lu, Zengxing (Author) , Lu, Yi (Author) , Wang, Zhiming (Author) , Zhong, Zhicheng (Author) , Zhao, Xiang (Author) , Li, Run-Wei (Author) , Zhang, Zhi Dong (Author) , Wang, Zhan Jie (Author)
Format: Article (Journal)
Language:English
Published: 13 August 2020
In: Acta materialia
Year: 2020, Volume: 199, Pages: 9-18
ISSN:1873-2453
DOI:10.1016/j.actamat.2020.08.016
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.actamat.2020.08.016
Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S1359645420306133
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Author Notes:Jun Liang Lin, Ri He, Zengxing Lu, Yi Lu, Zhiming Wang, Zhicheng Zhong, Xiang Zhao, Run-Wei Li, Zhi Dong Zhang, Zhan Jie Wang
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Summary:The enhancement of ferroelectric properties in lead-free ferroelectric is usually achieved by strain engineering. Here, we report a surprising polarization enhancement effect in an isostructural ferroelectric nanocomposite system composited by the ferroelectric material of BaTiO3 and metallic non-ferroelectric oxide of SrRuO3. BaTiO3:SrRuO3 (BTO:SRO) ferroelectric nanocomposite films with the volume ratio of nanogranular SRO ranging from 0 to 16% grown on the Nb-doped SrTiO3 (NSTO) single-crystal substrates by pulsed laser deposition (PLD) are investigated. Robust ferroelectric polarization is observed with a remanent polarization of about 40 μC/cm2, comparable to those found in Pb(ZrxTi1-x)O3 thin films. By combining X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), density functional theory (DFT) calculations, and phase-field simulation, a hypothesis has been proposed that the polarization enhancement may be mainly attributed to the accumulation of oxygen vacancies at the BTO/SRO interface rather than lattice mismatch strain. The novel mechanism of polarization enhancement opens new possibilities for designing future ferroelectric devices.
Item Description:Gesehen am 10.11.2020
Physical Description:Online Resource
ISSN:1873-2453
DOI:10.1016/j.actamat.2020.08.016

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