Abstract
The (1 − x)(Bi0.5Na0.42K0.08)0.96Sr0.04Ti0.975Nb0.025O3–xBiAlO3 (x = 0, 0.01, 0.02, 0.03, 0.05) lead-free ceramics were synthesized by means of the traditional solid-state reaction method. Influences of the BiAlO3 doping on structure, dielectric, and ferroelectric properties of the ceramics were systematically investigated. The X-ray diffraction (XRD) measurement was used to detect phase structure. The samples exhibit pseudocubic symmetry and dense microstructures. All of the ceramics, whether they were poled or unpoled, exhibit two dielectric anomalies on the dielectric spectra between room temperature and 350 °C, and no dielectric anomaly related to depolarization behavior was observed. The polarization loops and strain curves exhibit pinching-type shape and sprout shape, respectively. The corresponding mechanism was also discussed.
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