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Nature of polar state in 0.67BiFeO3–0.33BaTiO3

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Abstract

This study was conducted to understand the nature of the polar state in the morphotropic phase boundary composition 0.67BiFeO3–0.33BaTiO3 (0.67BF–0.33BT). Both the unpoled and poled specimens exhibit an average cubic structure. The poling induces a 0.14% increase in the lattice parameter. Macrodomains are absent both in the initial and polar state of 0.67BF–0.33BT. A typical relaxor-type dielectric anomaly was observed (Tf = ~ 627 K, TB = ~ 820 K). The remnant polarization (Pr), maximum value of electrostrain (Sm), and magnitude strain at Ec in the bipolar mode (Sneg) increase clearly during heating (Pr, ~ 40 µC/cm2; Sm, 0.191% under 40 kV/cm at 453 K). Unlike Bi0.5Na0.5TiO3-based nonergodic relaxors, the first-cycle bipolar electrostrain loops indicate that the minimum strain on the negative side of the bipolar strain curves is negative. Furthermore, the slopes of the relative permittivity versus log frequency plots in unpoled (− 21) and poled (− 23) specimens are similar. The transition between the relaxor state and ferroelectric-like state does not involve a clear dielectric anomaly even in the poled specimen.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Project No. 11704301), the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2018JQ1092), the Shaanxi Provincial Education Department Program (Program No.19JK0398), and the President’s Fund of Xi’an Technological University (Project no. XAGDXJJ18006).

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  1. Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, China

    Yongxing Wei, Jiahao Shen, Chenxing Bai, Changqing Jin & Gang Xu

  2. Electronic Materials Research Lab, Key Laboratory of Ministry of Education and International Center for Dielectric Research, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Weitong Zhu

  3. School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi’an, 710021, China

    Ye Tian

  4. Laboratory of Thin Film Techniques and Optical Test, Xi’an Technological University, Xi’an, 710032, Shaanxi, China

    Zhonghua Dai

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  1. Yongxing Wei
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Wei, Y., Shen, J., Bai, C. et al. Nature of polar state in 0.67BiFeO3–0.33BaTiO3. J Mater Sci: Mater Electron 31, 19266–19276 (2020). https://doi.org/10.1007/s10854-020-04462-9

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