采用粉末烧结法制备了添加不同质量分数(10％~40％)玻璃的 Ba(Fe0．5 Nb0．5)O3基复相陶瓷,利用 X射线衍射仪、扫描电镜、阻抗测试仪等研究了其微观结构和介电性能.结果表明：该复相陶瓷的主晶相为立方钙钛矿结构的 Ba(Fe0．5 Nb0．5)O3相,随着玻璃添加量的增加,复相陶瓷的晶粒尺寸逐渐减小,孔隙率降低；不同玻璃含量复相陶瓷均具有良好的介电性能,其相对介电常数和介电损耗角正切均随玻璃添加量的增加而降低；添加40％玻璃的复相陶瓷击穿场强最大,为296 kV?cm－1,添加10％玻璃的储能密度最大,为1．324 J?cm－3,晶界相对改善Ba(Fe0．5 Nb0．5)O3基复相陶瓷的击穿场强起主要作用.
The Ba(Fe0.5 Nb0.5 )O3 based composite ceramics with various glass content (10wt%-40wt%) were prepared by the powder sintering method.The microstructures and dielectric properties of the composite ceramics were investigated by the X-ray diffractometer,scanning electron microscope and impedance analyzer.The results show that the major phase of the composite ceramics was Ba (Fe0.5 Nb0.5 )O3 phase with cubic crystal structure.With the increase of the glass content,the grain sizes and porosities of the composite ceramics decreased gradually.The dielectric properties of the composite ceramics with different glass content were all excellent.The relative dielectric constant and tangent of dielectric loss angle both decreased with the increase of glass content.The breakdown strength of the composite ceramic with 40wt% glass reached the highest value of 296 kV?cm-1 ,while the energy storage density with 10wt% glass was the highest of 1.324 J?cm-3 .The grain boundary phase plays an important role in improving the breakdown strength of Ba(Fe0.5 Nb0.5 )O3 based composite ceramics.
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