Effect of sintering method on the microwave dielectric properties of (Pb0.45Ca0.55)(Fe0.5Nb0.5)O3 ceramics

The microwave dielectric properties of (Pb0.45Ca0.55)(Fe0.5Nb0.5)O3 (PCFN) were investigated for different sintering methods, double crucible and Pt crucible. For both sintering methods, a single phase PCFN with perovskite structure was obtained for the specimens sintered at 1100 °C. There was no difference in the relative density and dielectric constant for the specimens sintered at 1100 °C prepared by both sintering methods. However, the Qf value of the specimens prepared by Pt crucible method was higher than that of the specimens prepared by double crucible. The change of Qf values was studied by infrared reflectivity spectra from 50 to 4000 cm−1, and investigated in terms of Kramers–Kronig method and classical oscillator model.