Investigation On Rutile-like Microwave Dielectric Ceramics With Low Loss And Middle Permitivity

The development of high quality microwave dielectric ceramic is a key point for the miniaturization and selectivity of passive device,and owing to the need of these,a breaking through in the ??Qf value and ?f is most urgent nowadays.In this letter,ZnZrNb₂O₈ based and Zn₃Nb₂O₈ based microwave dielectric ceramic were doped for a better microwave properties,the crystal structure?phase constitution and microwave properties were investigated systematically.In addition,some microwave dielectric ceramic materials with good properties were presented.Firstly,monoclinal structure ZnZrNb₂O₈ was investigated by doping divalent cation.We choose Ni²⁺?0.69?,CN=6?cation which has a similar ionic radius with Zn²⁺?0.74?,CN=6?cation and Ca²⁺?1.00?,CN=6?cation which has a dissimilar ionic radius with Zn²⁺ as the doping ion.The phase constitution and the variation of crystal structure were investigated with the increasing doping content,and the relationship between that above and microwave dielectric properties were built.In addition,temperature stable ceramic materials were presented.Secondly,Ta₂O₅ was doped in ZnTiNb₂O₈ together for a improvement in dielectric properties.The content of Ta²⁺ cation were regarded as a variate.And the relationship between that above and microwave dielectric properties were built.What is more,a microwave dielectric ceramic material with good properties was got.Finally,?-PbO₂ structure Zn₃Nb₂O₈ based microwave dielectric ceramic with a small amount of doping divalent ions were investigated to explore the effect of different doping ion on crystal structure and phase constitution of the system.Crystal cell parameters,bond strength,packing fraction were used to represent the variation of crystal structure to analyzes the key factors influencing the performances of microwave Zn₃Nb₂O₈ based material.In addition,ZnZrNb₂O₈ based microwave dielectric ceramic material with good properties was got.