铌酸钠无铅陶瓷的制备和性能研究

Synthesis and properties of NaNbO_3 lead-free ceramics

采用传统陶瓷制备方法制备了致密的NaNbO3无铅铁电陶瓷。利用XRD、SEM、介电温谱等分析技术,研究了CuO和MnO2掺杂对NaNbO3无铅铁电陶瓷的合成温度、烧成工艺、结构相变以及铁电性能的影响。结果表明通过CuO和MnO2掺杂能在较低温度下制备出致密的NaNbO3陶瓷和陶瓷的致密度,电学性能随着烧成温度的变化存在一个最优值,最佳烧结温度为1050℃,体积密度达到4.38g/cm3为理论密度的98.6%。该陶瓷在15～120℃均表现出铁电性能,具有压电活性,常温下介电常数为287,居里温度为390℃。

In this paper,NaNbO3 lead-free ferroelectric ceramics was synthesized by a conventional solid state reaction at a low temperature.The effect of CuO and MnO2 on sintering temperature,structure and properties was studied by XRD,SEM and other methods.The result shows that CuO and MnO2-doped dense NaNbO3 lead-free ceramics was obtained at a low sintering temperature.The properties of NaNbO3 ceramics had a best sintering temperature of 1050℃.The density was 4.38g/cm3 and reached 98.6% of the theoretical density.Ferroelectric properties were observed from 15-120℃,the Curie temperature was 390℃.The dielectric constant was 287 and the dielectric loss was less than 2% at room temperature.