摘要
采用固相反应法合成BaO-Sm2O3-4TiO2(BST)陶瓷粉体。系统研究了溶胶-凝胶法引入ZnO-2B2O3-7SiO2(ZBS)玻璃对BST陶瓷烧结特性、物相组成、微观形貌及介电性能的影响。结果表明,添加ZBS玻璃的陶瓷试样主晶相仍为类钙钛矿钨青铜结构的BaSm2Ti4O12,次晶相为Sm2Ti2O7。通过溶胶-凝胶法添加6%(质量分数)的ZBS玻璃,可使BST陶瓷的烧结温度从1350℃降低到1050℃,在1050℃烧结3h所得BST陶瓷介电性能优良:εr=60.17,tanδ=0.004,τf=-7.9×10-6/℃。
BaO-Sm2O3-4TiO2 （BST） ceramic powder was prepared by solid state reaction method. The effects of doping ZnO-2B2O3-7SiO2 （ZBS） glass by sol-gel method on the sintering behaviors, phase composition, microstruc- ture and dielectric properties of BST ceramics were investigated. The experimental results reveal that the main phase of samples doped with ZBS glass is tungsten bronze structure type BaSm2Ti4O12 phase, a litter Sm2 Ti2O7 phase is also observed. The sintering temperature of BST ceramics is remarkably reduced from 1350℃ to 1050℃ and the good die- lectric properties of εr=60. 17, tanδ=0. 004, τf = -7. 9 × 10 6/℃ are obtained for BST ceramics doped with 6% （mass fraction） ZBS glass by sol-gel method sintered at 1050℃ for 3h.
基金
河南省杰出青年基金(074100510008)
河南省教育厅自然科学研究计划项目(2009A430005)
河南省科技发展计划(092300410135)
