改性Pechini法制备BaTi_(2)O_(5)陶瓷及其优异电学性能研究

Research on Excellent Electrical Properties of BaTi_(2)O_(5) Ceramics Prepared by a Modified Pechini Method

利用改性Pechini法制备了BaTi_(2)O_(5)(BT2)粉体,采用傅里叶红外光谱仪、X射线衍射仪(XRD)、冷场发射扫描电子显微镜(FESEM)和同步热分析仪测试了BT2粉体的物相结构与反应机理。结果表明,采用以柠檬酸为螯合剂的溶胶制备BT2粉体的最佳煅烧温度为850℃。粉体经1200℃的常压固相烧结得到BT2陶瓷,通过FESEM、电子比重天平、XRD、LCR数字电桥和准静态d_(33)测量仪测试了BT2陶瓷的物相结构与电学性能,结果显示BT2陶瓷具有较高的致密度、较好的结晶度与优异的电学性能。本研究为溶胶-凝胶法制备BT2陶瓷材料的提供了良好的借鉴。

BaTi_(2)O_(5)(BT2)particles are prepared by a modified Pechini method,the phase structure and reaction mechanism are analyzed by Fourier transform infrared spectroscopy,X-ray diffraction(XRD),field emission scanning electron microscope(FESEM),and simultaneous thermal analyzer.The results indicate the optimum calcination temperature of preparing BT2 powder by using citric acid as chelating agent is 850℃.BT2 ceramics are obtained from the powders by solid sintering at 1200℃at mospheric pressure.The ceramics phase structure and electrical properties are investigated by FESEM,electron specific gravity balance,XRD,LCR digital bridge,and quasistatic piezoelectric constant testing meter.The results show that BT2 displays high densification and perfect crystallinity as well as the excellent electrical properties.This study can provide a reference for the preparation of BT2 ceramic materials by sol-gel method.