Large piezoelectric response of BiFeO3/BaTiO3 polycrystalline films induced by the low-symmetry phase

Y. F. Hou; W. L. Li; T. D. Zhang; W. Wang; W. P. Cao; X. L. Liu; W. D. Fei

doi:10.1039/C5CP01320H

Large piezoelectric response of BiFeO₃/BaTiO₃ polycrystalline films induced by the low-symmetry phase

Y. F. Hou,^a W. L. Li,^ab T. D. Zhang,^a W. Wang,^a W. P. Cao,^a X. L. Liu^c and W. D. Fei*^a

* Corresponding authors

^a School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
E-mail: wdfei@hit.edu.cn
Fax: +86-451-86413908
Tel: +86-451-86413908

^b National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, People's Republic of China

^c Department of Materials Science and Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, P. R. China

Abstract

BaTiO₃, BiFeO₃ and BiFeO₃/BaTiO₃ polycrystalline films were prepared by the radio frequency magnetron sputtering on the Pt/Ti/SiO₂/Si substrate. The phase structure, converse piezoelectric coefficient and domain structure of BaTiO₃, BiFeO₃ and BiFeO₃/BaTiO₃ thin films are characterized by XRD and PFM, respectively. The converse piezoelectric coefficient d₃₃ of BiFeO₃/BaTiO₃ thin films is 119.5 pm V⁻¹, which is comparable to that of lead-based piezoelectric films. The large piezoelectric response of BiFeO₃/BaTiO₃ thin films is ascribed to the low-symmetry T-like phase BiFeO₃, because the spontaneous polarization vector of T-like phase (with monoclinic symmetry) BiFeO₃ can rotate easily under external field. In addition, the reduced leakage current and major domains with upward polarization are also attributed to the large piezoelectricity.

Article information

https://doi.org/10.1039/C5CP01320H

Article type

Paper

Submitted

06 Mar 2015

Accepted

27 Mar 2015

First published

02 Apr 2015

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Phys. Chem. Chem. Phys., 2015,17, 11593-11597

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Large piezoelectric response of BiFeO₃/BaTiO₃ polycrystalline films induced by the low-symmetry phase

Y. F. Hou, W. L. Li, T. D. Zhang, W. Wang, W. P. Cao, X. L. Liu and W. D. Fei, Phys. Chem. Chem. Phys., 2015, 17, 11593 DOI: 10.1039/C5CP01320H

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Physical Chemistry Chemical Physics

Large piezoelectric response of BiFeO₃/BaTiO₃ polycrystalline films induced by the low-symmetry phase

Abstract

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Large piezoelectric response of BiFeO₃/BaTiO₃ polycrystalline films induced by the low-symmetry phase

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