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Electrical properties of lanthanum and potassium doped barium titanate ceramics

Bijun Fang, Na Jiang, Qingbo Du, Limin Zhou, Yuejin Shan, Keitaro Tezuka, Hideo Imoto

Phase pure perovskite (Ba0.95La0.025K0.025)TiO3 (BLKT) ceramics were prepared by conventional ceramic processing. X-ray diffraction (XRD) measurement indicates that the sintered BLKT ceramics exist in pseudocubic structure. The relaxor behavior induced by ionic doping is confirmed by studying frequency and temperature dielectric behavior, polarization relaxation and P-E hysteresis loops upon heating. Remanent polarization (Pr) and coercive field of the BLKT ceramics are slight less than those of the pure BT ceramics. Piezoelectric constant d33 of the BLKT ceramics is 138- 165pC/Nwithin a pellet.