Abstract
Abstract In this study, Li2CO3-doped Bi0.5(Na0.8K0.2)0.5TiO3 (BNKT) ceramics were fabricated via the conventional solid-state reaction using ultrasound waves for preliminary milling. The milling time was shortened from 20 h to 1 h with ball milling. The phase structure of BNKT investigated by X-ray diffraction showed a single perovskite phase. With increasing Li2CO3 content, the phase structure of the ceramics changed from rhombohedral to tetragonal. At a sintering temperature of 1100 °C and Li2CO3 content of 0.4 wt.%, the best physical properties of the ceramics, such as density (ρ), 5.9 g cm−3; electromechanical coupling factors (k p), 0.32; (k t), 0.29; remanent polarization (P r), 12.0 μC cm−2; dielectric constant (∊ r), 1 191; and highest dielectric constant (∊ max), 5 800, were obtained.
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