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Journal of Advanced Ceramics 2021, 10(4): 809-819 https://doi.org/10.1007/s40145-021-0474-1
Research Article | Open Access | Issue | Published: 05 August 2021

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

Show Author's Information Tianxiang YANa( ),  Kaiyuan CHENa,  Chengqi LIa,  Min LIUb,  Jie WANGc,  Liang FANGa,  Laijun 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
Keywords:
crystal structure, ceramic, oxygen vacancies, dielectric spectroscopy
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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Abstract Full text About this article

(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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About this article

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

Show Author's information Tianxiang YANa( ), Kaiyuan CHENa, Chengqi LIa, Min LIUb, Jie WANGc, Liang FANGa, Laijun 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

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.

Keywords: crystal structure, ceramic, oxygen vacancies, dielectric spectroscopy

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Publication history
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Publication history

Received: 14 November 2020
Revised: 03 March 2021
Accepted: 10 March 2021
Published: 05 August 2021
Issue date: August 2021

Copyright

© The Author(s) 2021

Acknowledgements

This work was supported by the Natural Science Foundation of Guangxi (Grant Nos. 2019GXNSFBA245069, AA138162, GA245006, and AA294014), the Middle-aged and Young Teachers’ Basic Ability Promotion Project of Guangxi (Grant No. 2019KY0290), the Guilin University of Technology (Grant No. GUTQDJJ20176612037), the High Level Innovation Team and Outstanding Scholar Program of Guangxi Institutes, the Open Research Program of Key Laboratory of RF Circuit and System, Ministry of Education, and the Key Laboratory of Large Scale Integrated Design of Zhejiang.

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