Abstract
The ternary lead-free piezoelectric ceramics system of 0.90[x(Bi1/2Na1/2)TiO3–(1 − x)(Bi1/2K1/2)TiO3]–0.10(Bi1/2Ag1/2)TiO3 (x = 0.77, 0.79, 0.81, 0.83, 0.85) were successfully synthesized by conventional ceramic sintering technique. The samples were studied by X-ray diffraction, dielectric, ferroelectric and piezoelectric measurements. The MPB composition of the system appears to be near BNKA-79 according to the results of the X-ray diffraction and ferroelectric properties. The sample with x = 0.79 showed the highest piezoelectric constant d 33 = 160 pC/N. The maximum electromechanical coupling factors, k p and k t, are 0.30 for BNKA-79 and 0.42 for BNKA-85, respectively.
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