Abstract
AbstractLead‐free MnO‐doped 0.955K0.5Na0.5NbO3‐0.045Bi0.5Na0.5ZrO3 (abbreviate as KNN‐0.045BNZ) ceramics have been prepared by a conventional solid‐state sintering method in reducing atmosphere. The MnO addition can suppress the emergence of the liquid phase and improve the homogenization of grain size. All ceramics sintered in reducing atmosphere show a two‐phase coexistence zone composed of rhombohedral (R) and tetragonal (T) phase. MnO dopant results in the content increase in R phase and slight increase in Curie temperature TC. For KNN‐0.045BNZ ceramics, Mn2+ ions preferentially occupy the cation vacancies in A‐site to decrease oxygen vacancy concentration for 0.2%‐0.4% MnO content, whereas Mn2+ ions substitute for Zr4+ ions in B‐site to form oxygen vacancies at x ≥ 0.5. The defect dipole is formed at the moderate concentration from 0.5 to 0.6, which can provide a preserve force to improve the temperature stability of piezoelectric properties for kp and . The Mn0.4 ceramics show excellent electrical properties with quasistatic piezoelectric constant d33 = 300 pC/N, electromechanical coupling coefficient kp = 51.2%, high field piezoelectric constant = 430 pm/V (at Emax = 25 kV/cm) and TC = ~345°C, insulation resistivity ρ = 6.13 × 1011 Ωcm.
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