采用二次沉淀法制备了BaTiO3粉体,通过XRD和SEM对于粉体进行表征,采用模压法制备了BaTiO3/PVDF介电复合材料,并测试了复合材料的介电性能。结果表明:反应温度升高,产物BaTiO3的团聚程度降低;Ti4+浓度影响BaTiO3中BaCO3杂质含量;BaTiO3粉体体积分数为50%时,复合材料的介电性能最优;复合材料介电性能和BaTiO3粉体粒径有关,BaTiO3粉体粒径在100 nm时,介电常数最高。 The BaTiO3 powder was prepared by the secondary precipitation method. The powder was characterized by XRD and SEM. The BaTiO3 / PVDF dielectric composite material was prepared by molding and the dielectric properties of the composite were tested. The results show that the reaction temperature increases, the degree of agglomeration of the product BaTiO3 decreases; the concentration of Ba4 + affects the content of BaCO3 in BaTiO3; the dielectric properties of the composites are optimal when the volume fraction of BaTiO3 is 50%; the dielectric properties of BaTiO3 / Powder particle size, BaTiO3 particle size at 100 nm, the highest dielectric constant.