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Effects of CaHfO3 on the electrical properties of Bi0.49Na0.49Ca0.02TiO3 ferroelectric ceramics

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(1 − x) (Bi0.49Na0.49Ca0.02TiO3)-xCaHfO3 (BCNTH-x, x = 0.01, 0.02, 0.03, 0.035, 0.04) systems were prepared by solid-state reaction method. Their microstructures, dielectric/piezoelectric/ferroelectric properties and impedance spectroscopy were investigated. All compositions demonstrated a single orthorhombic structure with Pbnm space group. Temperature-dependent permittivity curves displayed one anomaly, which shifts to low temperature from 278 to 208 °C with increased CaHfO3 content, because of the replacement of Hf4+ for Ti4+ at the B-site that reduced B-site cation ordering. Analysis of dielectric and ferroelectric properties indicated that a crossover from typical ferroelectrics to relaxor ferroelectrics occurred in BCNTH-0.03 and BCNTH-0.035 ceramics. The largest electrostrictive strain of 0.22% and the lowest coercive field of 37.7 kV/cm were achieved in BCNTH-0.035 and BCNTH-0.03 ceramics under 100 kV/cm, respectively. Ferroelectric domain and domain wall were fitted by impedance complexes, and the corresponding activation energy was 0.46 and 1.18 eV, which may be correlated to the combination of motion of the first ionization of oxygen vacancies and doubly ionized oxygen vacancies, respectively.

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Acknowledgements

Financial supports of the National Natural Science Foundation of China (Grants Nos. 11464006, 61561011) and Guangxi Natural Science Foundation of China (Grant No. 2015GXNSFFA139002) are gratefully acknowledged by the authors.

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  1. Yong Liu and Yujie Zhang contributed equally to this work.

Authors and Affiliations

  1. College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin, 541004, People’s Republic of China

    Yong Liu, Yujie Zhang, Liufang Meng, Xiao Liu, Changrong Zhou, Xinyu Liu & Changlai Yuan

  2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, People’s Republic of China

    Liufang Meng, Changrong Zhou, Xinyu Liu & Changlai Yuan

  3. China Nonferrous Metals (Guilin) Geology and Mining Co,.Ltd, Guilin, 541004, People’s Republic of China

    Yong Liu

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  1. Yong Liu
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Liu, Y., Zhang, Y., Meng, L. et al. Effects of CaHfO3 on the electrical properties of Bi0.49Na0.49Ca0.02TiO3 ferroelectric ceramics. J Mater Sci: Mater Electron 31, 16209–16219 (2020). https://doi.org/10.1007/s10854-020-04116-w

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