Influences of Fe2O3 additives on the dielectric properties of BiNbO4 ceramics under different sintering atmosphere

BiNbO4 ceramic is one of the potential low-firing microwave dielectric materials for microwave applications. In this work, Fe oxides were doped into BiNbO4 ceramics. The samples were sintered in air and flowing N2, respectively. A comparative study of the sintering performance, the crystalline morphology and the dielectric properties (at both low frequency and microwave frequency) of samples sintered under both atmosphere were performed by means of SEM, LCR meter, network analyzer, and thermal environmental test chamber. Material’s dielectric performance under microwave frequency is especially considered. Then, the influences of Fe2O3 additives on the dielectric properties of BiNbO4 ceramics is investigated. At the same time, the defect influences on the dielectric properties were also discussed.