采用溶胶-凝胶法制备(1-x)Na0.5Bi0.5 TiO3-xK0.5Bi0.5TiO3体系无铅压电陶瓷.XRD分析表明,用溶胶-凝胶法可以在650℃下合成具有钙钛矿结构的(1-x)Na0.5Bi0.5TiO3-xK0.5Bi0.5TiO3粉体,且在x=0.18～0.30之间存在三方-四方准同型相界(MPB).陶瓷的压电性能参数表明,该体系在MPB组成范围内具有最佳的压电性能:x=0.30时,压电常数d33达到最大值(d33=150 Pc·N-1),平面机电耦合系数kp与介电常数εH33T/ε0均在x=0.26时达到最大值,分别为36.7%和1107.
In this paper, Sol-gel method was employed to prepare the (1-x) Na0.5Bi0.5TiO3-xK0.5Bi0.5TiO3 system lead-free piezoelectric ceramics. XRD results revealed that pure perovskite- type crystal structure of (1-x) Na0.5Bi0.5TiO3-xK0.5Bi0.5TiO3 powders can be synthesized by Sol-gel method calcined at 650 ℃, and the morphotropic phase boundary (MPB) with rhombohedral and tetragonal crystalline structure co-existed compositions was identified in the range of 0.18 to 0.30 of x concentration. In the MPB composition, the piezoelectric constant d33 reaches maximum 150 pC/N at x =0.30, and when x equals to 0.26, electromechanical coupling factor kp and dielectric constant εT33/ε0 reach the maximum value which are 36.7% and 1107, respectively.
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