Low-temperature sintering and microwave dielectric properties of CaTi1−x(Fe0.5Nb0.5)xO3 ceramics with B2O3 addition

CaTi1−x(Fe0.5Nb0.5)xO3 (0 ≤ x ≤ 1) dielectrics were synthesized via the solid state reaction route and structure analysis was performed together with the dielectric characterization. The substitution of Ti4+ by Fe3+/Nb5+ and developed phase were studied by X-ray diffraction. The dielectric constant and temperature coefficient of resonant frequency decrease rapidly with an increase of x. The influence of 1–5 wt.% B2O3 as a sintering additive investigated at CaTi0.5(Fe0.5Nb0.5)0.5O3 solid solutions. The dielectric properties were found to strongly depend on the sintering conditions and contents of B2O3 additions. ɛr = 52.3, Q × fo = 2930 GHz and Tf = 13 ppm/°C were obtained for CaTi0.5(Fe0.5Nb0.5)0.5O3 specimen 3 wt.% B2O3 sintered at 900 °C for 2 h.