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

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。

Sr、Ce and La co-doping on solid solution and dielectric property of( Ba, Sr) ( Ti, Ce) O3 ceramics

(Ba1-x-0.02SrxLa0.02)(Ti1-yCey)O3(x=0.05,0.10,0.15;y=0.03,0.04,0.05)(BSLTC)ceramics were prepared by the cold-pressing ceramic technique.The solid solution and dielectric properties were investigated by X-ray diffraction(XRD)and temperature-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.