Microwave dielectric properties of Sr2Ce2Ti5O16 ceramics

Sr2Ce2Ti5O16 dielectric ceramics were prepared by conventional solid-state ceramic route. The structure and microstructure of the ceramics were investigated by X-ray diffraction and scanning electron microscopic methods. The Sr2Ce2Ti5O16 has a psuedocubic structure. It has ɛr of 113, unloaded quality factor (Qu × f) of 8000 GHz and temperature coefficient of resonant frequency of 306 ppm/°C. The effects of various dopants on the structure, microstructure and microwave dielectric properties of the material have been investigated. It is found that addition of small amount of dopants such as PbO, Al2O3, Nd2O3, MoO3, CeO2, La2O3, Fe2O3 and NiO improve the microwave dielectric properties of Sr2Ce2Ti5O16.