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Lead-free relaxor ferroelectric ceramics Sr4+x Ca1−x BiTi3Nb7O30 with tunable transition temperature

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Abstract

Based on nominal components, Sr4+x Ca1−x BiTi3Nb7O30 (x = 0.25, 0.5, 0.75, 1) ceramics were prepared by means of solid-state reaction method. Their transition temperatures T m can be experimentally tuned by controlling the atomic ratio of Sr2+/Ca2+. All the samples are demonstrated to exhibit relaxor ferroelectric property above room temperature, and T m can be controlled effectively by changing the content of Sr2+ ion in A1 site. In addition, the linear relation between T m and the x corresponding to Sr2+ ion of A1 site indicates that relaxor ferroelectric with wide-ranging transition temperatures can be obtained, catering for the potential applications. Meanwhile, the dielectric maximum temperature T m of relaxation-I obeyed the Vogel–Fulcher law well, and Curie–Weiss fitting confirmed the displacive-type ferroelectric phase transition in these compounds.

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Acknowledgements

This work was supported by the Natural Science Foundation of China (Grant Nos. 61571403, 11174092, 11474111, 51002144) and Key Project of He’nan Educational Committee (Grant No. 14A140019).

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Authors and Affiliations

  1. School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450002, People’s Republic of China

    Gaoshang Gong, Yongqiang Wang, Dewei Liu & Yuling Su

  2. School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Gebru Zerihun & Songliu Yuan

  3. Henan Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, 464000, People’s Republic of China

    Yang Qiu

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  1. Gaoshang Gong
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  2. Yongqiang Wang
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  3. Dewei Liu
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  4. Yuling Su
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  5. Gebru Zerihun
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  6. Yang Qiu
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  7. Songliu Yuan
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Correspondence to Gaoshang Gong or Songliu Yuan.

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Gong, G., Wang, Y., Liu, D. et al. Lead-free relaxor ferroelectric ceramics Sr4+x Ca1−x BiTi3Nb7O30 with tunable transition temperature. J Mater Sci 51, 7336–7342 (2016). https://doi.org/10.1007/s10853-016-0018-1

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  • DOI: https://doi.org/10.1007/s10853-016-0018-1

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