采用二次固相反应法制备Ba0.7Sr0.3TiO3介电陶瓷,研究了掺杂钴、钇离子对钛酸锶钡介电性能的影响.结果表明,陶瓷样品Y3+、Co3+的最佳掺杂浓度分别为0.04mol％和0.05mol％,最佳烧结温度为1340℃,样品的相对介电常数为4200,介电损耗(tanδ)为0.005.样品的结构为四方晶系,P4mm空间群.获得了高介电常数、低损耗的Ba0.7Sr0.3TiO3介电陶瓷.%Dielectric ceramics of Ba0.2Sr0.3TiOs were prepared by two step Solid-state reaction method.The effects of co-balt and yttrium ion on dielectric properties of Ba0.7Sr0.3TiO3 were studied.Results indicted that the best doping concentra-tions of Y3+, Co3+ ions in ceramic samples are 0.04mol% and 0.05mol% respectively, Optimum sintering temperature is 1340℃, The relative dielectric constant of ceramic sample is 4200, and the dielectric loss (tand) is 0.005.Sample structure is tetragonal, P4mm space group.A Ba0.7Sr0.3TiO dielectric ceramics with high dielectric constant and low loss was obtained.
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