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Volume 12
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10.3390/coatings12040526
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Article

Microstructure and Electric Properties of Bi2O3-Doped (K0.5Na0.5)NbO3 Lead-Free Ceramics

by
Jiaqi Li
1,
Junjun Wang
1,*,
Fengmin Wu
1,*,
Hui Ma
1,
Tianyi Ma
1,
Yu Tian
1,
Danqing Liu
2 and
Bin Yang
3
1
School of Science, Harbin University of Science and Technology, Harbin 150080, China
2
School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China
3
Institute of Functional Materials and Sono- Photo- Instruments, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
*
Authors to whom correspondence should be addressed.
Coatings 2022, 12(4), 526; https://doi.org/10.3390/coatings12040526
Submission received: 23 February 2022 / Revised: 8 April 2022 / Accepted: 11 April 2022 / Published: 13 April 2022
(This article belongs to the Special Issue Ferroelectric Thin Films and Composites)
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Abstract

In this paper, Bi2O3-doped (K0.5Na0.5)NbO3 (x = 0.1, 0.2, 0.3, 0.4) lead-free ceramics are prepared by a conventional solid-state reaction and analyzed by studying the structure, ferroelectric, and piezoelectric properties. It is found that the doping of Bi2O3 increases the proportion of the trigonal phase in KNN ceramics, thus enabling the construction of KNN ceramics with an orthogonal–trigonal phase boundary at room temperature. At the same time, doping with Bi2O3 can reduce the grain size and improve grain size uniformity of the ceramics. The KNN-0.1%Bi2O3 ceramic has the best piezoelectric properties in all composition; the results are as follows: d33 = 121pC/N, kp = 0.474, kt = 0.306.
Keywords: KNN lead-free ceramics; Bi2O3 doping; grain effects; piezoelectric property KNN lead-free ceramics; Bi2O3 doping; grain effects; piezoelectric property

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MDPI and ACS Style

Li, J.; Wang, J.; Wu, F.; Ma, H.; Ma, T.; Tian, Y.; Liu, D.; Yang, B. Microstructure and Electric Properties of Bi2O3-Doped (K0.5Na0.5)NbO3 Lead-Free Ceramics. Coatings 2022, 12, 526. https://doi.org/10.3390/coatings12040526

AMA Style

Li J, Wang J, Wu F, Ma H, Ma T, Tian Y, Liu D, Yang B. Microstructure and Electric Properties of Bi2O3-Doped (K0.5Na0.5)NbO3 Lead-Free Ceramics. Coatings. 2022; 12(4):526. https://doi.org/10.3390/coatings12040526

Chicago/Turabian Style

Li, Jiaqi, Junjun Wang, Fengmin Wu, Hui Ma, Tianyi Ma, Yu Tian, Danqing Liu, and Bin Yang. 2022. "Microstructure and Electric Properties of Bi2O3-Doped (K0.5Na0.5)NbO3 Lead-Free Ceramics" Coatings 12, no. 4: 526. https://doi.org/10.3390/coatings12040526

APA Style

Li, J., Wang, J., Wu, F., Ma, H., Ma, T., Tian, Y., Liu, D., & Yang, B. (2022). Microstructure and Electric Properties of Bi2O3-Doped (K0.5Na0.5)NbO3 Lead-Free Ceramics. Coatings, 12(4), 526. https://doi.org/10.3390/coatings12040526

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