【摘要】 目的研究焙烧温度和烧结温度对由溶胶-凝胶法制备的掺镍钛酸钡样品微结构及介电性能的影响。方法采用溶胶-凝胶法制备了掺镍钛酸钡粉体及其陶瓷,通过FT-IR,XRD,SEM和TEM对干凝胶粉体、预烧粉体以及陶瓷进行了表征,并测定陶瓷的介电性能。结果采用溶胶-凝胶法可制备纳米级(30~80 nm)掺镍钛酸钡粉体及其细晶陶瓷(1~3μm);较高的焙烧温度有利于四方相钛酸钡的形成和晶粒的长大,但降低了陶瓷的介电常数;较高的烧结温度有利于陶瓷居里点介电常数的提高,合适的焙烧温度及烧结温度分别为800℃和1 300℃。结论溶胶-凝胶法可制得组成均匀、性能优异的介电材料,是制备多组分掺杂钛酸钡陶瓷的理想方法。更多还原

【Abstract】 Aim To study the effects of calcining temperature and sintering temperature on the microstructures and dielectric properties of the ceramics prepared by the sol-gel process.Methods The powders and ceramics of BaTiO₃ doped with nickel were prepared by a sol-gel process.The dry gel,powders and ceramics were characterized by FT-IR,XRD,SEM and TEM methods.Results The result shows that the nanosized powders with particles of 30～80 nm and fine-grained ceramics of 1～3 μm can be prepared by the sol-gel process.Higher calcining temperature is of benefit to the formation of tetrahedron BaTiO₃ phase and growth of the grain.And the higher sintering temperature is good for increasing of dielectric constant at Curie temperature.Conclusion The optimum calcining and sintering temperatures are 800℃ and 1 300℃ respectively.Since the sol-gel process is very good for the modification of ceramic dielectric property,it is an ideal method to prepare the BaTiO₃ doped with many additions.更多还原