Enhanced dielectric properties and dispersive phase transformation of Nb 5+ -doped BaZr 0.1 Ti 0.89 Fe 0.01 O 3 ceramics

In this article, the Nb5+-doped BaZr0.1Ti0.89Fe0.01O3 ceramics were prepared by sol–gel method. The effects of the crystallographic structure, micro-morphology, dielectric properties, and dispersive phase transition of Nb5+ dopant BaZr0.1Ti0.89Fe0.01O3 ceramics were studied. The results show that all samples show a unitary characteristic perovskite-type peak. The dopant of Nb5+ could increase these samples density and the grain size, thereby improving their electrical properties. The increase of dispersive phase transition can be ascribed to the larger grain size and the decrease of long-range ordered micro-regions. When the Nb5+ doping amount is 0.75 mol%, it has the largest dispersive phase transition and the optimal dielectric properties: e25 °C = 7671, Tc = 40 °C, tanδ = 0.0067, and γ = 1.89.