Capacitor is one of the electronic components which used widely on research about industry, agriculture, na-tional defense, scientific and human daily life. Ceramic capacitor has the characteristics of high temperature resistance, corrosion resistance, high dielectric constant and stable performance. It is able to meet the requirements of miniaturization and high capacity current. Ba1-xCaxZr0.1Ti0.9O3 doped 0. 05%Y2O3(mole percent) dielectric ceramics were prepared by raw materials such as BaCO3 , CaCO3 , ZrO2 and TiO2 . The effect of micromorphology and dielectric properties by adding CaCO3 were studied. The results show that:CaCO3 doping have no effect on the main crystal phase of the sample, but the grain size increases with the addition of CaCO3 . When εr of the sample increases at room temperature, tanδ abruptly in-creases firstly and then decreases. Meanwhile, the curie temperature of the samples moves to a lower temperature, but the phenomenon is not obvious. With decreasing value of εr peak, the temperature change rate is reduced.%电容器是电子设备中大量使用的电子元件之一，在工农业、国防、科学研究和日常生活中都有广泛的应用。其中陶瓷电容器具有耐高温、耐腐蚀、介电常数高、性能稳定等特点，满足当前集成电路对电容器小型化、高容量的要求。以BaCO3、 CaCO3、 ZrO2和TiO2等为原料， Y2 O3为掺杂剂，以掺杂量为0.05％Y2O3（摩尔百分比）的Ba1－xCaxZr0.1Ti0.9O3陶瓷材料为研究对象，研究了CaCO3加入物对体系微观形貌和介电性能的影响。结果表明， CaCO3的加入不改变试样主晶相，但随着CaCO3掺杂量的增加，晶粒尺寸逐渐增大，试样的室温介电常数εr 有所提高，试样的介电损耗tanδ骤然增大，然后降低。与此同时，材料的居里温度向低温方向移动，但移动范围较小；样品的介电常数峰值逐渐降低，样品的介电常数温度变化率减小。
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