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Microstructure, phase structure and electrical properties of 0.954K1−x Na x NbO3–0.04Bi0.5Na0.5ZrO3–0.006BiFeO3 lead-free ceramics

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Abstract

In this work, 0.954K1−x Na x NbO3–0.04Bi0.5Na0.5ZrO3–0.006BiFeO3 (KN x N–BNZ–BF) lead-free ceramics were fabricated by conventional ceramic technique. The effect of K/Na ratio on microstructure, phase structure and electrical properties was systematically investigated. The orthorhombic-tetragonal phase transition temperature (T O–T) increases and rhombohedral–orthorhombic phase transition temperature (T R–O) drops simultaneously with increasing the Na content, leading to an R–O–T phase boundaries in the ceramics with 0.44 ≤ x ≤ 0.60. By tailoring their K/Na ratio and optimizing the sintering temperature, an enhanced electrical properties (e.g. d 33 ~ 438 pC/N, k p ~ 0.51, T c ~ 320 °C, ε r ~ 2304 and tan δ ~ 0.029) was obtained at the ceramics with x = 0.56 sintered at 1090 °C, which could be attributed to the preferably density as well as the R–O–T phase boundary nearer the room temperature. Therefore, we think that the KN x N–BNZ–BF ceramic is a promising candidate for piezoelectric devices.

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Acknowledgements

This work was supported by Project (Grant Nos. KYTZ201312 and J201220) Supported by the Scientific Research Foundation of CUIT, the Fundamental Research Funds for the Central Universities of Southwest University for Nationalities (No. 2014NZYQN11), the Foundation of Sichuan province science and technology support program, China (Grant No. GZ0198) and Scientific Research Project of Sichuan Provincial Department of Education (Grant No. 16ZA0216).

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Authors and Affiliations

  1. Sichuan Province Key Laboratory of Information Materials and Devices Application, Chengdu University of Information Technology, Chengdu, 610225, People’s Republic of China

    Bo Wu, Wenjuan Wu & Min Chen

  2. Physics Department, Southwest University for Nationalities, Chengdu, 610041, People’s Republic of China

    Jian Ma

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  1. Jian Ma
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  2. Bo Wu
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  3. Wenjuan Wu
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  4. Min Chen
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Correspondence to Bo Wu.

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Ma, J., Wu, B., Wu, W. et al. Microstructure, phase structure and electrical properties of 0.954K1−x Na x NbO3–0.04Bi0.5Na0.5ZrO3–0.006BiFeO3 lead-free ceramics. J Mater Sci: Mater Electron 28, 4458–4466 (2017). https://doi.org/10.1007/s10854-016-6075-z

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