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The microwave dielectric properties of (1-x)CaTiO 3 -xSm(Mg 1/2 Ti 1/2 )O 3 (0.1=<x=<1.0) have been investigated. The system forms a solid solution throughout the entire compositional range. The dielectric constant decreases from 86 to 25 as x varies from 0.1 to 1.0. The Qxf varies non-linearly and increases for composition with x=<0.6. The nonmonotonic variation with composition x is more pronounced in τ f than in r . The microwave dielectric properties indicate the possibility of a phase transformation for x between 0.4 and 0.5.