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Research Article | Open Access

Structure evolution, dielectric, and conductivity behavior of (K0.5Na0.5)NbO3-Bi(Zn2/3Nb1/3)O3 ceramics

Tianxiang YANa( )Kaiyuan CHENaChengqi LIaMin LIUbJie WANGcLiang FANGaLaijun LIUa
College of Mechanical and Control Engineering & College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
Institute of Fluid Engineering Equipment, Jiangsu Industrial Technology Research Institute, Jiangsu University, Zhenjiang 212013, China
Key Laboratory for RF Circuits and Systems, Ministry of Education & Key Laboratory of Large Scale Integrated Design, Hangzhou Dianzi University, Hangzhou 310018, China
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Abstract

(1-x)K0.5Na0.5NbO3-xBi(Zn2/3Nb1/3)O3 ((1-x)KNN-xBZN, x = 0.010, 0.015, 0.020, 0.025, and 0.030) lead-free ceramics were fabricated via a traditional solid-state method. The crystal structure, microstructure, dielectric, and conductivity behavior of this system were studied. Combined with X-ray diffraction (XRD) patterns, Rietveld refinement, and dielectric spectroscopy, an orthorhombic phase was determined for x = 0.010, an orthorhombic-tetragonal mixed phase was identified for x = 0.015, and a rhombohedral symmetry appears in 0.020 ≤ x ≤ 0.030. Both 0.98KNN-0.02BZN and 0.975KNN-0.025BZN ceramics exhibit stable permittivity and low dielectric loss tangent (tanδ) in wide temperature ranges owing to the combination of rhombohedral-tetragonal step-like feature and the diffuse phase transition from tetragonal to cubic. The activation energies of dielectric relaxation and conductivity behavior at high temperatures initially decrease slightly, then drop sharply, and finally decline slowly, which could be attributed to microstructure morphologies and the concentration of oxygen vacancies.

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Journal of Advanced Ceramics
Pages 809-819
Cite this article:
YAN T, CHEN K, LI C, et al. Structure evolution, dielectric, and conductivity behavior of (K0.5Na0.5)NbO3-Bi(Zn2/3Nb1/3)O3 ceramics. Journal of Advanced Ceramics, 2021, 10(4): 809-819. https://doi.org/10.1007/s40145-021-0474-1

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Received: 14 November 2020
Revised: 03 March 2021
Accepted: 10 March 2021
Published: 05 August 2021
© The Author(s) 2021

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