锆钛酸钡陶瓷的超低温烧结及其介电特性

Low Temperature Sintering of Barium Zirconate Titanate(BZT)Ceramics and Their Dielectricity

利用钛酸四丁酯、硝酸锆、氢氧化钡为原料在室温下,直接合成了颗粒尺寸均匀,组分连续可调的高性能锆钛酸钡纳米粉体。在此基础上,通过添加不同比例的Bi_2O_3和Li_2CO_3为助烧剂,实现了900℃下的陶瓷的超低温烧结。确立了烧结时间与陶瓷微观结构之间的相关性。研究表明,助烧剂的加入,可以使介电峰强烈地向低温方向移动,室温介电常数可大于5000以上。某些情况下使介电峰分裂,由单一峰变为明显的双峰,这样使得介电常数的温度稳定性得到提高。

High performance BZT nanoparticles with homogenous grain size and tailorable compositions were synthesized at room temperature directly using butenal titanate,zirconium nitrite and barium hydroxide as raw materials. With above mentioned nanoparticles,super low temperature sintering was completed at 900 ℃ by adding sintering aids with different Bi / Li ratio. The relationship between sintering soaking time and ceramic microstructures was studied. The dielectric peak shift towards to the end at low temperature and enlarged the dielectric constant at room temperature over 5000 through adding sintering aids. Under some situation,there are tow dielectric peak and enhances the stability of the temperature dependence of dielectric constant.