Abstract
MnO2-doped lead-free ceramics 0.91K0.45Li0.05Na0.5NbO3-0.08BaZrO3-0.01Bi0.5Na0.5TiO3 (KNLN-BZ-BNT-Mn) were prepared by conventional solid-state reaction method. Dielectric and piezoelectric properties of the ceramics with different amount of MnO2 were studied. The experimental results showed that MnO2 was an effective sintering aid to decrease the sintering temperature with enhanced the dielectric and piezoelectric properties. Upon using MnO2 additives, the sintering temperature of KNLN-BZ-BNT-Mn ceramics was lowered to 1020 °C, while the relative density was enhanced to the highest of about 98% for 0.4 mol% MnO2-doped one. From crystal structure identification by X-ray diffraction, all of the ceramics studied in this work showed a two-phase coexistence of perovskite rhombohedral (R) and tetragonal (T) phases. The 0.4 mol% MnO2-doped ceramic exhibited the following optimum properties: d33 = 292 pC N−1, kp = 0.47, εr = 2096, tan δ = 0.025, and TC = 205 °C when sintering temperature was 1020 °C.
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