Abstract
To upgrade piezoelectric properties of lead-free ceramics, (Ba0.85Ca0.15) (Zr0.09Ti0.91)O3 + 0.6 wt% Li2CO3 ceramics by doping tantalum oxide (Ta2O5) were successfully fabricated by microwave sintering (MWS) and conventional solid phase sintering (CS), respectively. The results show that piezoelectric performance of the ceramics by MWS (d33 ~ 317 pC/N, Pr ~ 12.39 µC/cm2 and Tc~ 101 °C, respectively) is significantly enhanced compared with the ceramics by CS (d33 ~ 203 pC/N, Pr ~ 9.33 µC/cm2 and Tc~ 94 °C, respectively), and the optimum properties by doping the Ta2O5 are obtained at x = 0.04 wt%, which is attributed to that rhombohedral–tetragonal (R–T) phase coexists in samples by MWS. The temperature-dependent dielectric performance of the ceramics manifests evident relaxor phenomena under 1 MHz by MWS, which proved that the samples were relaxor ferroelectrics with a large dielectric constant (5512, x = 0.04 wt%).
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