CeO2-modified BiNbO4 microwave ceramics sintered under atmosphere

The effects of CeO2 addition on the sintering behaviors and the microwave dielectric properties of BiNbO4 ceramics were investigated. CeO2 addition lowered the phase transition temperature (from orthorhombic to triclinic phases) and decreased the sinterability of BiNbO4 ceramics. Low oxygen partial pressure atmosphere were found to enhance the sinterability and accelerate the phase transition procedure of the ceramics. The change of dielectric constants and quality factors with the bulk densities and the phase compositions of the ceramics were reported. The (Bi0.95Ce0.05)NbO4.025 ceramics sintered at 950 °C had a remarkable microwave dielectric property.