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Good electrical performances and impedance analysis of (1 − x)KNN–xBMM lead-free ceramics

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Abstract

(1 − x)(K0.5Na0.5)NbO3–xBi(Mg0.75Mo0.25)O3 [(1 − x)KNN–xBMM] (x = 0.005, 0.01, 0.02) ceramics were prepared via a solid-state reaction method. X-ray diffraction patterns (XRD) and Raman spectrum showed that a solid solution was formed between the BMM and KNN, which improved the electrical properties of KNN. With increasing the BMM content, the grain firstly increased and then decreased. When x = 0.01, the ceramics exhibited the optimized microstructure, indicating that there exits an optimal doping component. Temperature dependence of relative permittivity also increases firstly and then decreases. The relative permittivity (εr) of ~ 1418 in stabilization zone, εmax ~ 4861 at the Curie temperature T C ~ 394 °C, good temperature stability ∆ε/ε123 °C ≤ ± 15% from 123 °C to 348 °C, and the dielectric loss tanδ ≤ 0.036 from 109 to 348 °C were obtained for 0.99KNN-0.01BMM ceramics. Conductivity behavior of the (1 − x)KNN–xBMM was investigated as a function of temperature from 420 to 520 °C and frequency from 40 to 106 Hz, showing that the basic mechanisms of conduction and relaxation processes were thermally activated, and oxygen vacancies were the possible ionic charge transport carriers at higher temperatures.

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Acknowledgements

This work was supported by Natural Science Foundation of China (Nos. 11364012 and 11664008), Natural Science Foundation of Guangxi (Nos. 2017GXNSFDA198027, 2015GXNSFDA139033 and 2017GXNSFFA198011).

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Authors and Affiliations

  1. Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, People’s Republic of China

    Xiao Yan, Xiuli Chen, Xiaoxia Li, Gaofeng Liu, Hailin Zhang & Huanfu Zhou

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  1. Xiao Yan
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  2. Xiuli Chen
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  3. Xiaoxia Li
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Correspondence to Xiuli Chen or Hailin Zhang.

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Yan, X., Chen, X., Li, X. et al. Good electrical performances and impedance analysis of (1 − x)KNN–xBMM lead-free ceramics. J Mater Sci: Mater Electron 29, 4538–4546 (2018). https://doi.org/10.1007/s10854-017-8403-3

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