Non-Arrhenius behavior of grain growth in (K, Na)NbO3-based ceramics and its effect on piezoelectric properties. Issue 24 (15th December 2022)

• Record Type: Journal Article
• Authors: Pan, Yongqi; Huang, Longfei; Feng, Jie; Yu, Xinyu; Xu, Zunping; Chen, Yi
• Is Part Of: Ceramics international. Volume 48:Issue 24(2022)
• Page Start: 37085
• Page End: 37094
• Publication Date: 2022-12-15
• Subjects: A. Grain growth -- B. Grain size -- C. Piezoelectric properties -- D. Niobates; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.08.284
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A study was performed of the grain growth behavior of ordinary (K, Na)NbO3 –based ceramics, including (K, Na)NbO3 –Bi0.5 Na0.5 TiO3 and (K, Na)NbO3 –Bi0.5 Na0 · 5 ZrO3 systems. These ceramics were sintered at a series of temperatures. Via the observation of surface microstructures and the analysis of Arrhenius graphs, the grain growth of both ceramics was found to experience three stages with increasing sintering temperature. In the first stage, which was in a relatively low temperature range, increasing the sintering temperature resulted in a gradual increase in grain size, complying with the characteristics of thermal activation. As the sintering temperature rose to a higher temperature range, the grain growth entered the second stage, where increasing the sintering temperature caused the grain size to decrease, showing an anti-thermal grain growth behavior. In the third stage, the ceramics resumed the behavior of thermally activated grain growth with the further increase of sintering temperature. The reasons were discussed for the non-Arrhenius grain growth behavior of (K, Na)NbO3 –based ceramics. In addition, the effect of non-Arrhenius grain growth behavior on piezoelectric properties was studied as well.