Study on phase transitions and temperature stability of (1-x)K0.5Na0.5NbO3-xBi(Zn0.5Zr0.5)O3 lead-free ceramics

A (1-x)K0·5Na0·5NbO3-xBi(Zn0·5Zr0.5O3) was designed and prepared by a conventional ceramic fabrication method. The effects of doping amount on phase structure, microstructure and electrical properties were investigated. It was found that when the doping content x = 0.008, a multi-phase coexistence r...

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Bibliographic Details
Published in:Materials chemistry and physics 2020-08, Vol.250, p.123032, Article 123032
Main Authors: Xi, Kaibiao, Li, Yuanliang, Zheng, Zhanshen, Zhang, Lifang, Liu, Yun, Mi, Yueshan
Format: Article
Language:English
Subjects:
Ceramics
Curie temperature
Doping
Electrical properties
Grain size
Lead free
Multiphase coexistence
Phase transition
Phase transitions
Piezoelectric constant
Piezoelectricity
Room temperature
Solid phases
Stability
Temperature stability
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Summary:A (1-x)K0·5Na0·5NbO3-xBi(Zn0·5Zr0.5O3) was designed and prepared by a conventional ceramic fabrication method. The effects of doping amount on phase structure, microstructure and electrical properties were investigated. It was found that when the doping content x = 0.008, a multi-phase coexistence region is formed. In the area where the two phases coexistence, it showed the best piezoelectric performance (d33~238 pC/N) together with a high Curie temperature (Tc~316 °C). In addition, the scanning electron microscopy (SEM) revealed that the doping content has a significant effect on the grain size and density. Particularly, the d33 remains stable between room temperature and Tc. The temperature stability of the system is enhanced. [Display omitted] •Bi(Zn0.5Zr0.5)O3 modified (K,Na)NbO3-based lead-free piezoelectric ceramics.•Construction of orthorhombic-tetragonal phase coexistence.•An obviously bimodal distribution of grain sizes.•The d33 remains stable between room temperature and Tc.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2020.123032