Observation of electrical and energy storage properties of lead-free transition metal-doped BaBi2(NbTa)O-9 nanoceramics prepared through chemical route

A-site doping of BaBi2NbTaO9 by Ni2+ was synthesized by chemical precursor solution decomposition method. The materials exhibited single-phase tetragonal structure. The crystallite size of the calcined powder exhibited 42 nm with high degree of tetragonality. Curie temperature (T-c) was not found upto 600 degrees C that indicated higher T-c of the material. Impedance spectroscopy showed non-Debye type of relaxation with semiconducting nature. The closeness of the activation energy for imaginary impedance relaxation and DC conductivity indicated same type of charge carriers. P-E hysteresis loop indicated ferroelectric properties of the material. Energy storage densities were calculated for charge and discharge. The highest energy efficiency was observed at 10 kV/cm electric field.