锶、铈和镧共掺杂铈钛酸锶钡陶瓷的固溶性和介电性能的研究

Sr、Ce and La co-doping on solid solution and dielectric property of(Ba,Sr)(Ti,Ce)O_3 ceramics

采用冷压陶瓷技术,制备了(Ba1-x-0.02SrxLa0.02)(Ti1-yCey)O3(x=0.05,0.10,0.15;y=0.03,0.04,0.05)(BSLTC)陶瓷,通过X射线衍射(XRD)和介电温谱测试对BSLTC陶瓷的固溶性和介电性能进行调查。XRD结果表明,所有样品均为立方钙钛矿结构,La掺杂量为2%时,能够将(Sr,Ce)组合的固溶提高到(x=0.10,y=0.04)或(x=0.15,y=0.03)。介电结果表明,各样品的居里温度都在室温附近,介电峰明显宽化。其中,(x=0.05,y=0.03)组合的样品显示出最高的室温介电常数(ε'RT≈6000)和低介电损耗(tanδ<0.02),满足美国EIA"Y5V"高介电陶瓷材料指标。

（ Ba1-x-0. 02 Sr, La,0 02 ） （ Ti1-y Cey ） 03 （ x = 0. 05,0. 10, 0. 15 ; y = 0. 03, O. 04,0. 05 ） （ BSLTC ） ceramics were prepared by the cold-pressing ceramic technique. The solid solution and dielectric properties were investigated by X-ray diffraction（XRD）and tem- perature-dependent dielectric-constant measurements. The XRD results indicated that, BSLTC ceramics show an average cubic perovskite structure. When La = 0. 02, the solid solution of the （ Sr, Ce） composition can be improved to （ x = 0. 10, y = 0. 04 ） or （ x = 0. 15 ,y=0. 03 ）. The dielectric results indicated that for all samples the Curie temperature is in the vicinity of room temperature and the dielectric peak is markedly broadened. The ceramic with x = 0.05 and y = 0. 03 shows higher room-temperature dielectric constant（ ε＇RT≈ 6000） ,lower dielectric loss（tanδ〈0.02）and meets the U. S. EIA＇Y5V＇high dielectric specification.