ZnO-MgO-TiO_2-SnO_2系高频介电陶瓷的制备与介电性能

Preparation and dielectric properties of ZnO-MgO-TiO_2-SnO_2 system high frequency dielectric ceramic

在ZnO-TiO2-SnO2陶瓷基础上,掺杂MgO得到(1-x)ZnO-xMgO-0.88TiO2-0.12SnO2系新型介电陶瓷。对其相转变、微观组织结构和高频介电性能进行了研究,结果表明,在不加入任何烧结助剂情况下,试样可于1 080℃达到烧结,其相对密度为94.4%;当x=0.05时,陶瓷为纯相尖晶石结构(Zn0.95,Mg0.05)2(Ti0.88,Sn0.12)O4,其介电性能优良,1 MHz时ε=18.88,tanδ=5×10-4,τε=2.89×10-6/℃,可用作高频电容器材料的优秀候选材料。

(1-x)ZnO-xMgO-0.88TiO2-0.12SnO2 ceramic was synthesized as a type of new ceramic by doping MgO on the basis of ZnO-TiO2-SnO2 ceramic,of which the phase transition,microstructure and high frequency dielectric properties were studied.The results showed that without any sintering aids,the compound with pure spinel structure (Zn0.95 ,Mg0.05 )2 (Ti0.88 ,Sn0.12 )O4 can be sintered at 1 080 ℃ while x=0.05.According to the bulk density and dielectric properties,the compound’s relative density is 94.4% with excellent high-frequency dielectric properties ofε=18.88,tanδ=5×10-4 ,τε=2.89×10-6/℃at 1 MHz,indicating that the compound can serve as a promising high-frequency dielectric capacitor.