Compared with the composite samples with a fixed Ba/Sr ratio, the graded samples possess higher tunability and better temperature stability of dielectric properties. The results show that the samples sintered at 1375☌ for 3 h are a composite phase of perovskite and spinel structure with a Ba/Sr ratio composition gradient. Their microstructure and dielectric properties were analyzed by X-Ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive Spectroscope (EDS) and dielectric property measurements. (BaxSr1-x)TiO3/ Mg2TiO4 composite ceramics with a constituent graded structure were prepared by a solid-state reaction method.
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