MICROWAVE DIELECTRIC-PROPERTIES OF BA6-3XSM8-SOLUTIONS WITH SR SUBSTITUTED FOR BA(2XTI18O54 SOLID)

We have evaluated the effect of substituting Sr cations for Ba cations in solid solutions with a tungsten bronze-type structure used in micr owave dielectric resonators. Instead of Ba6-3xSm8+2xTi18O54 solid solu tions formula, the structure formula is presented as (Sm8+2xBa2-3x) (B a-4)Ti18O54 for the range of 0 less than or equal to x less than or eq ual to 2/3 and (Sm9.33+2(x-2/3)) (Ba4-3(x-2/3))Ti18O54 for 2/3 less th an 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 ser ies, because the substitution reduced the strain caused by the Ba ions . The relationship between the lattice parameters and the microwave di electric properties is also presented.