Issue 17, 2015

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

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.

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

Article information

Article type
Paper
Submitted
06 Mar 2015
Accepted
27 Mar 2015
First published
02 Apr 2015

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

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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