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Dielectric, ferroelectric and impedance properties of Li+-doped 0.97Na0.4K0.1Bi0.5TiO3–0.03Ba0.7Sr0.3TiO3 ceramics

Abstract

A series of Li+-doped 0.97Na0.4K0.1Bi0.5TiO3–0.03Ba0.7Sr0.3TiO3 ceramics were prepared by using the conventional solid-state reaction technique. The phase structure, dielectric, ferroelectric and impedance properties were systemically studied. X-ray powder diffraction patterns reveal that all the ceramics possess a pure perovskite phase. Ferroelectric property tests clearly show the disruption of the long-range ferroelectric order as the Li+ doping content increases. Dielectric permittivity results suggest that the samples experience a transformation from ferroelectric to relaxor phase with increasing the Li+ concentration, while the diffuse factors further confirm the enhanced relaxor characteristic. Complex ac impedance data shows that charge carriers obey the long-range conductivity mechanism at low doping levels (x ≤ 0.01), while it changes to a localized mechanism at high doping levels (x ≥ 0.03). The active energy fitted by the relaxation time becomes smaller as the Li+ concentration increases, revealing the increasing concentration of oxygen vacancies. We argue that the increasing concentration of vacancies should be responsible for the enhanced relaxor characteristic by disturbing the long-range ferroelectric orders.

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Acknowledgements

This work was supported by National Science Foundation of China (NSFC Nos. 51772238) and the CSS Project (Grant No. YK2015-0602006). The Research Project of GSEDU 2018 (2018B-101). Prof. X. J. Lou would like to thank the ‘‘One Thousand Youth Talents’’ program for support.

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Correspondence to Cheng Wang or Xiaojie Lou.

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Wang, C., Lou, X. Dielectric, ferroelectric and impedance properties of Li+-doped 0.97Na0.4K0.1Bi0.5TiO3–0.03Ba0.7Sr0.3TiO3 ceramics. J Mater Sci: Mater Electron 29, 14589–14595 (2018). https://doi.org/10.1007/s10854-018-9594-y

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