Structure and properties of zinc titanate dielectric ceramic doped with Nd_2O_3 and Sm_2O_3

In order to improve the properties of ZnTiO3 dielectric ceramic,the effects of Nd2O3 and Sm2O3 doping on its microstructure and dielectric properties were investigated.Microwave dielectric properties of ZnTiO3 dielectric ceramic were measured using the TEM type coaxial resonator.The results show that,a new crystalline phase Sm2Ti2O7 is detected in the prepared ceramic doped with Sm2O3 and the decomposition of ZnTiO3 can be inhibitted by a little amount of Sm2O3 doping;new crystalline phases Nd2Ti2O7 and Nd4Ti9O24 are detected in the prepared ceramic doped with Nd2O3;the unloaded Q values of resonators made from doped prepared ceramics are both increased,and the effect of Nd2O3 doping is better than that of Sm2O3 doping;Nd2O3 doping make the τf of the prepared ceramic change from positive value to negative value;the ceramic with τf near zero and unloaded Q value larger than 260 can be obtained by adjusting Nd2O3 doping amount in 5%～10%(mass fraction),which can be used to manufacture the filters applied in decimeter wave band.