Effects of additions on the dielectric properties of (SrPb)(CaMg)TiO3-Bi2O3:3TiO2 ceramics

The authors describe the new system (Sr_7/9Pb_2/9 ) (Ca_1/5Mg_4/5) TiO₃-Bi₂O₃:3TiO₂, focusing on the change in its dielectric properties with Bi₂O₃ :3TiO₂ additions. The dielectric constants increase rapidly with Bi₂O₃:3TiO₂ addition up to 4 mol.% and decrease at contents beyond that concentration. The dielectric constants thus depend on the Bi₂O₃:3TiO ₂ content. The tan δ rapidly increases as a function of temperature below 20°C. Temperature coefficients of capacitance rapidly decrease as the Bi₂O₃:3TiO₂ content is increased, but the specimens above 6 mol.% are nearly independent with respect to the content. Both ΔC% and tan δ% as a function of frequency are stable up to 100 kHz for all the specimens with above Bi₂O₃:3TiO₂ above 4[mol.%]