The effect of (Bi0.5Li0.5)0.9Sr0.1ZrO3 substitution on the construction of polymorphic phase boundary and high curie temperature of K0.45Na0.55NbO3 piezoelectric ceramics

In this experiment, new high-temperature piezoelectric ceramics (1−x)K0.45Na0.55NbO3−x(Bi0.5Li0.5)0.9Sr0.1ZrO3 were prepared by the conventional solid-state sintering method, and the effect of the doping amount of (Bi0.5Li0.5)0.9Sr0.1ZrO3 on the microstructure and electrical properties of this system ceramics were systematically investigated. XRD, SEM, EDS, and other modern test technology analysis results show that all the doped ions have entered the KNN lattice in the studied range, forming a dense solid solution with a pure perovskite structure, and forming orthorhombic–tetragonal polymorphic phase boundaries at 0.02 ≤ x ≤ 0.035, the ceramics exhibit rhombohedral–tetragonal polymorphic phase coexistence in the range of 0.04 ≤ x ≤ 0.05. The electrical properties tests show that the ceramics of this system exhibit excellent electrical properties in the multiphase coexistence region at x = 0.04, which are: d33 = 307pC/N, kp = 46