Structure, dielectric and energy storage properties of BaTiO3 ceramics doped with YNbO4

Abstract

(1−x)BaTiO3−xYNbO4 [(1−x)BT−xYNb] (x = 0%, 3%, 5%, 7%, 10%, 15%) ceramics were prepared by a traditional solid-state reaction method. A solubility limit for (1−x)BT−xYNb was determined to be less than 3%. The phase transition from tetragonal to pseudo cubic were manifested via the XRD and Raman spectra. When x = 3% and 5%, a second liquid-like phase appeared in SEM images. As the YNb additive increased, the dielectric constant-temperature curves shifted towards low temperature and the dielectric nonlinearity was suppressed. At x = 7%, the recoverable energy storage density of 0.93BT−0.07YNb achieved a maximum of 0.614 J/cm3, which was 2.4 times of pure BaTiO3, as well as the efficiency was up to 87%. These results indicated that the BaTiO3 ceramic doped with YNb would be a promising alternate material for high energy storage density capacitor.