title: Modification of both d33 and TC in a potassium-sodium niobate ternary system.
abstract: In this work, we simultaneously achieved a giant d33 and a high TC in a lead-free piezoelectric ternary system of (1-x-y)K0.48Na0.52NbO3-xBiFeO3-yBi0.5Na0.5ZrO3 {(1-x-y)KNN-xBF-yBNZ}. Owing to the rhombohedral-orthorhombic-tetragonal (R-O-T) phase coexistence and the enhanced dielectric and ferroelectric properties, the ceramics with a composition of (x = 0.006, y = 0.04) show a giant d33 of ∼428 pC N(-1) together with a TC of ∼318 °C, thereby proving that the design of ternary systems is an effective way to achieve both high d33 and high TC in KNN-based materials. In addition, a good thermal stability for piezoelectricity was also observed in these ceramics (e.g., d33 > 390 pC N(-1), T ≤ 300 °C). This is the first time such a good comprehensive performance in potassium-sodium niobate materials has been obtained. As a result, we believe that this type of material system with both giant d33 and high TC is a promising candidate for high-temperature piezoelectric devices.
authors.affiliation: Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China. wujiagang0208@163.com msewujg@scu.edu.cn nic0402@scu.edu.cn.
authors.forename: Bo
authors.initials: B
authors.lastname: Wu
authors.forename: Jiagang
authors.initials: J
authors.lastname: Wu
authors.forename: Dingquan
authors.initials: D
authors.lastname: Xiao
authors.forename: Jianguo
authors.initials: J
authors.lastname: Zhu