PbO–SiO_2玻璃对Ba_(0.4)Sr_(0.6)TiO_3陶瓷致密度和介电性能的影响

EFFECTS OF PbO–SiO_2 GLASS ON DENSIFICATION AND DIELECTRIC PROPERTIES OF Ba_(0.4)Sr_(0.6)TiO_3 CERAMICS

为了制备耐高压、高储能密度陶瓷电容器,研究了不同PbO-SiO2(PS)玻璃添加量对Ba0.4Sr0.6TiO3陶瓷致密度和介电性能的影响。结果表明:PS玻璃能有效降低Ba0.4Sr0.6TiO3陶瓷的烧结温度,细化晶粒,提高样品的致密度。添加适量PS玻璃改善了Ba0.4Sr0.6TiO3陶瓷的介电性能。添加质量分数为1%PS玻璃的Ba0.4Sr0.6TiO3陶瓷在1100℃烧结致密,相对密度达到98.3%,平均击穿场强达到15.4kV/mm,相对于纯Ba0.4Sr0.6TiO3陶瓷的提高了1.5倍,1kHz的室温相对介电常数达到1179,介电损耗为6×10-4。

To fabricate high voltage,high energy density ceramic capacitors,the effects of different amounts of PbO–SiO2（PS） glass additive on the densification behavior and dielectric properties of Ba0.4Sr0.6TiO3 ceramics were investigated. The results show that the PS glass effectively decreases the sintering temperature,increases the densification and refines the grain size of Ba0.4Sr0.6TiO3 ceramics. The dielectric properties of Ba0.4Sr0.6TiO3 ceramics are improved with the appropriate amount of PS glass additive.The Ba0.4Sr0.6TiO3 ceramics with 1% （in mass） PS glass are densified at 1 100 ℃, with high relative density of 98.3%, and average breakdown strength of 15.4 kV/mm, which is increased by a factor of 1.5 compared with that of pure Ba0.4Sr0.6TiO3 ceramics; the relative dielectric constant and dielectric loss are 1 179 and 6 × 10^-4 at 1 kHz, respectively.