论文部分内容阅读
Following the objective to provide suitable materials to substitute for the currently used lead based ceramics,the development of high performance lead-free piezoelectrics has been an issue of major scientific concern in the past ten years.Compared to other lead-free ceramics,piezoelectric strain in unmodified sodium potassium niobate(KNN)is only moderate.However,high mechanical quality factors(Qm)were found in materials of this system.