Preparation and properties of Sr(Bi1−xNdx)8Ti7O27 ceramics for wireless technologies

Sr(Bi1−xNdx)8Ti7O27 ceramics for wireless technologies were prepared by a solid-state reaction route. Raw materials of SrCO3, Bi2O3, Nd2O3 and TiO2 were used. The mixture was ball-milled, dried, and hydro-pressed into pellets or formed into green body by gel-casting, which were then sintered at 1180–1300 °C. Sintering process was analyzed by TGA and DSC. Microstructure of ceramic body was observed by SEM. Crystalline phases of the ceramics were identified by X-ray diffraction. Dielectric properties of the samples were also measured, showing dielectric constant ε=80–110 and Qf=120–2100 GHz at 10 GHz.