Microwave dielectric properties of Ba6-3xSm8+2xTi18O54 solid solutions with Sr substituted for Ba

We have evaluated the effect of substituting Sr cations for Ba cations in solid solutions with a tungsten bronze-type structure used in microwave dielectric resonators. Instead of Ba6-3xSm8+2xTi18O54 solid solutions formula, the structure formula is presented as (Sm8+2xBa2-3x) (Ba-4)Ti18O54 for the range of 0 less than or equal to x less than or equal to 2/3 and (Sm9.33+2(x-2/3)) (Ba4-3(x-2/3))Ti18O54 for 2/3 less than or equal to x less than or equal to 1. The quality factor Q. f has been improved based on the substitution of 0.2 Sr ions for 0.2 Ba ions in perovskite blocks in (Sm9.2Ba0.2)(Ba-4)Ti18O54 where x = 0.6. This composition has the best dielectric quality in the solid solution series, because the substitution reduced the strain caused by the Ba ions. The relationship between the lattice parameters and the microwave dielectric properties is also presented.