采用传统电子陶瓷工艺制备了符合X7R指标的BaTiO3陶瓷系统,研究了预烧过程对该系统结构和介电性能的影响.XRD和SEM分析表明,对BaTiO3粉料的预烧增大了晶粒尺寸并增加了c/a比,预烧过程通过增加c/a比提高了铁电性,极大地提升了介电常数,但是由于电畴重定向的驰豫机制也导致了损耗角的少量增加.没有经过预烧的BaTiO3陶瓷(1240℃烧结),其相结构近似立方相(c/a=1.0005),而把BaTiO3粉料经过预烧(1200℃),同样烧结条件(1240℃)的BaTiO3陶瓷相结构为四方相c/a=1.0030.BaTio3系统在1200℃预烧和1240℃烧结得到的样品具有满足X7R指标的优良介电性能,其介电性能为:εr≥4500,⊿εr/εr≤±15%(-55～125℃),tanδ≤0.012(25℃).
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