Electrical conductivity of B-site Fe3+ doped Na0.5Bi0.49TiO3 ceramic

Abstract

Na0.5Bi0.49Ti1-xFexO3-δ (NBT) powder materials with x=0, 0.02, 0.04, and 0.06 were prepared by solid-state synthesis method. Flaky ceramic samples were prepared by pressing and sintering at 1000-1150 ℃. The effect of Fe3+ doping amount x on NBT ceramic properties was studied by XRD, SEM and EIS testing. The results show that a new phase NaBiTi6O14 appears in the NBT material after Fe3+ doping, and the content increases with the increase of doping amount. After doping, the sintering temperature of the sample decreases by 100-150 ℃, while the grains become smaller. Within the testing temperature range of 300-700 ℃, the conductivity of samples with x=0.02, 0.04, and 0.06 is on the same order of magnitude at the same temperature, which are about 1000 times higher than that of samples with x=0. The sample with x=0.04 has the highest conductivity, reaching 9.8 mS/cm and 17.0 mS/cm at the test temperatures of 600 ℃ and 700 ℃, respectively.

Keywords

• na0.5bi0.49tio3
• fe3+ doping
• electrical conductivity
• oxygen ion conductor