单分散亚微米球形Ba0.97Gd0.02TiO3粉体及其细晶陶瓷的制备

目的制备Ba_(0.97)Gd_(0.02)TiO_3细晶陶瓷。方法采用常压水相法有效控制了单分散亚微米球形Ba_(0.97)Gd_(0.02)TiO_3粉体的粒径大小和均匀性,并制备得到Ba_(0.97)Gd_(0.02)TiO_3细晶陶瓷。利用XRD、TEM和SEM等表征分析了样品的物相及微观形貌,并研究了Ba_(0.97)Gd_(0.02)TiO_3陶瓷的介电性能。结果Ba_(0.97)Gd_(0.02)TiO_3粉体粒径主要分布在230~300nm范围,粒径大小均一。同时,Ba_(0.97)Gd_(0.02)TiO_3细晶陶瓷的室温介电常数提高到2 983,居里峰展宽,温度稳定性明显改善。结论常压水相法可很好的控制Ba_(0.97)Gd_(0.02)TiO_3粉体的形貌,进而得到细晶陶瓷材料且性能有所改善。

Fabrication of monodispersed submicron Ba0.97Gd0.02TiO3 spherical particles and fine-grained ceramics

Purposes-To prepare fine-grained Ba0.97Gd0.02TiO3 ceramics.Methods-The hydro-phase method was used to control the dispersion and particle size of Ba0.97Gd0.02TiO3 particles, and fine-grained Ba0.97Gd0.02TiO3 ceramics was obtained.The phase and microstructure of samples are analyzed by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy-dispersive spectroscopy.The dielectric properties of the ceramics were investigated.Results-It is found that the distribution of monodispersed submicron Ba0.97Gd0.02TiO3 particles was narrow (230~300 nm) and their sizes were uniform.Dense and fine-grained Ba0.97Gd0.02TiO3 ceramics obtained by sintering has a permittivity of 2 983, Curie peak broadening and temperature stability were improved obviously.Conclusion-The hydro-phase method can control morphology of the Ba0.97Gd0.02TiO3 powder very well, and the obtained fine-grain ceramics has improved performance.