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(K0.5Na0.5)NbO3-Bi(Cu2/3Nb1/3)O3 Lead-free Ceramics: Phase Transition, Enhanced Dielectric and Piezoelectric Properties

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Abstract

(1 − x)(K0.5Na0.5)NbO3-xBi(Cu2/3Nb1/3)O3 [(1 − x)KNN-xBCN, 0 ≤ x ≤ 0.02] lead-free piezoelectric ceramics were prepared by a solid-state reaction method. The effects of BCN addition on the phase transition, microstructure and electrical properties of ceramics were studied. X-ray diffraction and Raman spectroscopy analysis confirmed that the BCN has diffused into KNN to form a solid solution. Both polymorphic phase transition, T O-T, and Curie temperature, T c, gradually decreased with increasing the BCN content. Moreover, the relative permittivity (ε r) was increased greatly and the dielectric loss (tanδ) was almost decreased. Ferroelectric hysteresis loops (P–E) of samples showed that the remnant polarization (P r) was up to a maximum value with 26.52 μm/cm as x = 0.01. The piezoelectric properties of ceramics increased with increasing the x values. When x = 0.005 and 0.01, the ceramics exhibited high piezoelectric constant with 131 pC/N and 105 pC/N over a good piezoelectric stability under 350°C, respectively. These results indicate that BCN addition is an effective way to enhance the properties of KNN ceramics.

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Authors and Affiliations

  1. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi Key Laboratory in Universities of Clean Metallurgy and Comprehensive Utilization for Non-ferrous Metals Resources, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China

    Xiuli Chen, Xiao Yan, Gaofeng Liu, Xiaoxia Li, Guisheng Huang & Huanfu Zhou

Authors
  1. Xiuli Chen
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  2. Xiao Yan
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  3. Gaofeng Liu
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  4. Xiaoxia Li
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  5. Guisheng Huang
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  6. Huanfu Zhou
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Correspondence to Xiuli Chen.

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Chen, X., Yan, X., Liu, G. et al. (K0.5Na0.5)NbO3-Bi(Cu2/3Nb1/3)O3 Lead-free Ceramics: Phase Transition, Enhanced Dielectric and Piezoelectric Properties. J. Electron. Mater. 47, 794–799 (2018). https://doi.org/10.1007/s11664-017-5859-0

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  • DOI: https://doi.org/10.1007/s11664-017-5859-0

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