Preparation and Physical Properties of SCNN Ceramics With a Two-stage Sintering Method

By using two-stage sintering method based on the traditional process equipment,one lead free piezoelectric ceramics Sr_2-xCa_xNaNb₅O₁₅(SCNN) was prepared.By studying the different Sr doping concentrations x from 0.05 to 0.30,piezoelectric constant is up to 80 pC/N,and dielectric permittivity is even more than 1 600.This SCNN ceramics are characterized by X-ray diffraction and scanning electron microscope.Results show that this ceramics have high density structure.