Structure and Properties of (Bi0.45Y0.05)Na0.5(Zr0.85Sn0.15)O3-doped (K0.5Na0.5)NbO3 Piezoelectric Ceramics
摘要
(1−x)K0.5Na0.5NbO3-x(Bi0.45Y0.05)Na0.5(Zr0.85Sn0.15)O3 ceramics with high density were sintered by the traditional solid-phase process, and their structural and electrical properties have been systematically investigated. XRD, EDS, and dielectric temperature spectroscopy test results showed that all the samples of the ceramic system exhibited a pure perovskite structure at 0 ≤ x ≤ 0.05, formed an orthogonal structure at 0 ≤ x < 0.03, and showed the coexistence of an orthogonal–tetragonal polycrystalline phase at 0.03 ≤ x ≤ 0.05. Electrical performance tests of the ceramics of this system showed that the polycrystalline phase boundary (PPB) region at x = 0.04 presented an excellent performance: εr = 1286, kp = 43.2%, tanδ = 2.9%, Pr = 26.2 μC/cm2, TC = 340°C, and d33 = 341 pC/N. These excellent electrical properties bode well for the application of this system of ceramics in the field of lead-free piezoelectric ceramics.