Large Piezoelectric Response Induced by the Coexistence of Low-Symmetry and Self-Polarization in Li+-Nb5+-Doped BiFeO3 Polycrystalline Films
Large Piezoelectric Response Induced by the Coexistence of Low-Symmetry and Self-Polarization in Li+-Nb5+-Doped BiFeO3 Polycrystalline Films
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DOI：
10.1021/acs.jpcc.5b12291
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发表时间：
2016-03
影响因子：
3.7
通讯作者：
Yafei Hou;Weili Li;Tiandong Zhang;W. Cao;Yang Yu;T. Bai;W. Fei
中科院分区：
文献类型：
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作者：
Yafei Hou;Weili Li;Tiandong Zhang;W. Cao;Yang Yu;T. Bai;W. Fei
Pure BiFeO3 (S1) and Li+-Nb5+-pair-doped BiFeO3 (S2, S3, and S4) films were prepared by the radio-frequency magnetron sputtering onto the LaNiO3-buffered Pt/Ti/SiO2/Si substrate. The phase structure of the doped BiFeO3 films is low-symmetry T-like phase owing to the chemical pressure induced by the substitution of larger Li+ and Nb5+ for smaller Fe3+, which is different from the pure BiFeO3 film (high-symmetry R phase). Compared with the pure BiFeO3 film, the dielectric, ferroelectric, and piezoelectric performances are greatly enhanced, especially for the piezoelectric response of 9 wt % Li+-Nb5+-doped BiFeO3 (S3) film. The converse piezoelectric coefficient d33 of S3 film is 114.1 pm/V, which is comparable to that of lead-based piezoelectric films. The excellent piezoelectricity of S3 film is considered as the coupling results of low-symmetry T-like phase BiFeO3 and upward self-polarization because the polarization vectors of the T-like phase and nanodomains rotate easily under small external stimuli. I...
