用固相合成方法制备了Sr_2Bi_4Ti_5O_(18)铁电陶瓷,研究了烧结温度对Sr_2Bi_4Ti_5O_(18)铁电陶瓷相结构、显微结构、铁电性能和介电性能的影响,分析了相关机理.结果表明,在1150C℃进行烧结,样品晶粒发育完全,晶粒α轴择优取向,铁电性能优良,剩余极化强度2P,达到15.3μC/cm2、矫顽场强2E_c为103kV/cm;在100kHz～1MHz频率范围内,介电常数为176～168,介电损耗为0.027～0.025,具有较好的频率稳定性.
Bismuth-layered compound Sr_2Bi_4Ti_5O_(18) (SBTi) ferroelectric ceramic samples were prepared by solid-state reaction method. Effect of sintering temperature on crystal structure, mierostrueture and ferroeleetric properties of the SBTi ferroelectric ceramics were studied. It is found that crystals developed entirely and a-axis orientation is enhanced for Sr_2Bi_4Ti_5O_(18) ferroelectric ceramics sintered at 1150℃. At this sintering temperature, the highest remnant polarization 2P_r and coercive field 2E_c of the ceramics are 15.3μC/cm~2 and 103kV/cm, respectively. These results can be explained as follows: Bismuth in the pseudo-perovskite blocks evaporates easily at high sintering temperatures that leads to oxygen vacancies. The dielectric constant and dielectric loss of SBTi is 176 ～168 and 0.027 ～ 0.025 measured at 100kHz ～ 1MHz, respectively.
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