LAUSR

Abstract High-performance (1-x)Bi0.5(Na0.78K0.22)0.5TiO3-xBaTiO3 lead free ceramics were synthesized by traditional solid-state technology. Combined with K+ doping and BaTiO3 solid solution modification, morphotropic phase boundary was constructed and the electrical performance of NBT-based ceramics were significantly improved. The sample (x = 0.06) has maximum dielectric constant of 2054, minimum dielectric loss of 0.034, piezoelectric constant increased from 140pC/N to 184pC/N, and planar electromechanical coupling coefficient increased from 30% to 49%. The modified samples improve the depolarization temperature and the stability of piezoelectric constant at high temperature. The obtained electrical parameters are compared with the results in other references. Lattice theory and domain theory were used to explain the origin of excellent piezoelectric performance.