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Chinese Journal of Materials Research  2024, Vol. 38 Issue (1): 51-60    DOI: 10.11901/1005.3093.2022.647
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Effect of BNZ Component on Structure and Property of KNN Based Lead-free Piezoelectric Ceramics
LI Bosen, LIAO Zhongxin, GAO Daqiang()
School of Physical Science and Technology, Lanzhou University, Lanzhou 730030, China
Cite this article: 

LI Bosen, LIAO Zhongxin, GAO Daqiang. Effect of BNZ Component on Structure and Property of KNN Based Lead-free Piezoelectric Ceramics. Chinese Journal of Materials Research, 2024, 38(1): 51-60.

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Abstract  

In order to promote the practical application of lead-free piezoelectric ceramics, in this paper, a kind of sodium potassium niobate-sodium bismuth zirconate (1-x)K0.48Na0.52Nb0.96Sb0.04O3-x(Bi0.5Na0.5)ZrO3 lead-free piezoelectric ceramics were prepared, and their crystallographic structure and performance were assessed. Results show that their relative dielectric constant and the resonant frequency temperature are stable (< 10‰) with the variation of temperature; the piezoelectric ceramics are typical perovskite structure, and the most compact ceramic sample is obtained with x=0.04, which endows RD=97.43%, d33 = 463 pC/N, kp = 0.55 and Qm = 37; the piezoelectric ceramics consists of tripartite-tetragonal (R-T) two-phases and the existence of nanodomain structure may be the cause for the excellent piezoelectric properties of ceramic materials.

Key words:  inorganic non-metallic materials      piezoelectric ceramics      potassium sodium niobate      nanometer domain      temperature stability     
Received:  07 December 2022     
ZTFLH:  TQ174  
Fund: Gansu Province Education and Technology Innovation Youth Doctoral Program(2022QB-002);Lanzhou University Odiwei Sensor Co. Ltd., Joint Research Institute Project
Corresponding Authors:  GAO Daqiang, Tel: 18919960427, E-mail: gaodq@lzu.edu.cn

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2022.647     OR     https://www.cjmr.org/EN/Y2024/V38/I1/51

Fig.1  SEM and grain size distribution of potassium sodium niobate-bismuth sodium zirconate lead-free piezoelectric ceramics with different BNZ contents (a~f) SEM images of the surface; (g, h) x = 0.04 section SEM; (i~n) size distribution
Fig.2  Physical properties of lead-free piezoelectric ceramics with potassium sodium niobate and bismuth sodium zirconate at different BNZ contents and comparison with the reported ceramic[32~36] properties of similar systems
Fig.3  XRD and Rietveld refinement pattern at room temperature of KNN-xBNZ ceramics (a) XRD spectrum; (b) locally amplified XRD pattern of 2θ = 32°; (c~h) Rietveld refinement pattern for x = 0~0.06; (i) phase proportion distribution of x = 0~0.06
x00.020.030.040.050.06
PhaseOOTOTRTRTC
Ratio/%10080.2819.7262.2837.7215.8184.193.496.6100
a/nm0.39350.39610.39790.39650.39720.39650.39710.39880.39740.3978
b/nm0.56300.56410.39790.56390.39720.39650.39710.39880.39740.3978
c/nm0.56540.56520.39990.56460.40020.39650.40020.39880.40000.3991
c/a--1.0050-1.0076-1.0078-1.0065
Table 1  Cell parameters and T phase c/a values of x = 0~0.06 ceramic
Fig.4  Raman spectra of KNNS-xBNZ ceramics at room temperature (a); variation of Raman displacement for each vibration mode (b); x = 0.04 ceramic Raman spectra (c) and fitting lines of vibration modes ν1 and ν2 of ceramics with x = 0.04 (d)
Fig.5  Dielectric temperature spectra of ceramics with different x (a, b, d, e); phase transition temperature variations of ceramics with different x (c, f)
Fig.6  Full picture of electric hysteresis loop of ceramic samples under different x (a); changes of Ec, Pmax, Pr with x (b); the variation of d33 and εrPr with x (c); relative permittivity εr and series resonant frequency Fs temperature coefficient of ceramics with x = 0.04 at -40~100oC and 20oC as the contrast diagram with temperature (d)
Fig.7  TEM of ceramic sample with x = 0.04 (a, b) and SEM of ceramic sample with x = 0.04 (c)
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