Microstructure and Electric Properties of Bi2O3-Doped (K0.5Na0.5)NbO3 Lead-Free Ceramics

In this paper, Bi2O3-doped (K0.5Na0.5)NbO3 (x = 0.1, 0.2, 0.3, 0.4) lead-free ceramics are prepared by a conventional solid-state reaction and analyzed studying the structure, ferroelectric, piezoelectric properties. It is found that doping of Bi2O3 increases proportion trigonal phase in KNN ceramics, thus enabling construction with an orthogonal–trigonal boundary at room temperature. At same time, can reduce grain size improve uniformity ceramics. The KNN-0.1%Bi2O3 ceramic has best properties all composition; results as follows: d33 121pC/N, kp 0.474, kt 0.306.