title: Achieving both giant d(33) and high T(c) in patassium-sodium niobate ternary system.
abstract: Both giant d33 and high TC have been obtained in a lead-free piezoelectric ternary system (0.995 - x)K0.48Na0.52NbO3-0.005BiScO3-xBi0.5(Na0.7K0.2Li0.1)0.5ZrO3. Thanks to the rhombohedral-tetragonal phase coexistence and the enhanced dielectric and ferroelectric properties, the ceramic with a composition of x = 0.04 shows a giant d33 of ∼366 pC/N together with TC of ∼335 °C, thereby paving the way for achieving both high d33 and high TC in KNN-based materials. In addition, such a ceramic has a good thermal stability of d33 (e.g., d33 > 319 pC/N, T ≤ 300 °C) and an enhanced stability of ferroelectric properties against temperature. The domain-wall energy barrier of ∼0.15 eV is derived from the temperature dependence of the back-switching polarization.
authors.affiliation: Department of Materials Science, Sichuan University , Chengdu 610064, P. R. China.
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Cheng
authors.forename: Jiagang
authors.initials: J
authors.lastname: Wu
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Lou
authors.forename: Xiangjian
authors.initials: X
authors.lastname: Wang
authors.forename: Xiaopeng
authors.initials: X
authors.lastname: Wang
authors.forename: Dingquan
authors.initials: D
authors.lastname: Xiao
authors.forename: Jianguo
authors.initials: J
authors.lastname: Zhu