LiSbO<sub>3</sub>掺杂对KNN基无铅压电陶瓷结构及压电性能的影响

doi:10.11896/cldb.24110207

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Abstract Piezoelectric ceramics are showing a growing trend in applications with high piezoelectric coefficients and high power, such as transducers and piezoelectric generators. To prevent the piezoelectric devices from failing at high temperature conditions, a higher mechanical quality factor (Q_m) value is necessary. Extensive research has shown that parameters such as piezoelectric coefficients and mechanical quality factor exhibit a trade-off relationship, making it a significant challenge to improve the mechanical quality while maintaining a high piezoelectric coefficient in piezoelectric materials. This work uses solid-state sintering method to prepare (1-x) (K_0.44Na_0.56Nb_0.98Ta_0.02O₃)-xLiSbO₃ (x=0.01, 0.02, 0.03, 0.04) ceramics, abbreviated as KNNT-LS. The results showed that adding an appropriate amount of LiSbO₃ can form R-O phase boundaries at low temperature and O-T phase boundaries at room temperature, and the phase structure transition temperature is close to room temperature, constructing R-T coexisting phases. This is beneficial for synergistic modulation to improve piezoelectric performance and expand its working temperature range, the increase of second-phase grains and the emergence of oxygen vacancies have intensified the pinning effect, enhancing the Q_m value of the ceramic. The performance reaches its optimal level at x=0.02 (d₃₃=248 pC/N, T_C=379 ℃, Q_m=145, ε_r=33 650 (1 kHz, 379 ℃)). In addition, the mechanical quality factor (Q_m) has been significantly improved by the regulation of doping components and oxygen vacancies. The findings are helpful to understand the nature of multiphase coexistence caused by doping components in this system and the inf-luence of oxygen vacancies on piezoelectric properties, which has broad applications in high-power devices.

Key words： potassium sodium niobate(KNN) lead-free piezoelectric ceramics phase transition microstructure oxygen vacancy mechanical quality factor

Published: 10 December 2025 Online: 2025-12-03

CLC number:

TM282

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	Articles by authors
	LONG Haiyang
	WANG Tao
	CAO Jun
	LI Yanhui
	MA Rucheng
	LI Xiaoshuo
	WANG Bochao
	LIU Zhicun
	FANG Jiao

Cite this article:

LONG Haiyang,WANG Tao,CAO Jun, et al. Effects of LiSbO₃ Doping on the Structure and Piezoelectric Properties of KNN-based Lead-free Piezoelectric Ceramics[J]. Materials Reports, 2025, 39(23): 24110207-9.

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https://www.mater-rep.com/EN/10.11896/cldb.24110207 OR https://www.mater-rep.com/EN/Y2025/V39/I23/24110207

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