Enhanced dielectric properties and energy storage density of Mg-doped SrTiO3 nanowire films

Abstract

To improve dielectric properties of SrTiO3-based materials and meet their development requirements in various scientific and technology fields, Mg-doped SrTiO3 nanowire films (with 0, 0.5, 1, 1.5 and 2mol% Mg) were fabricated by liquid phase deposition (LPD) process. The results showed that structural and dielectric properties of the prepared samples can be effectively affected by Mg doping. Thus, the SrTiO3 nanowire film doped with 1.5mol% Mg has high dielectric constant of 594.2, a low dielectric loss of 0.0167 and the highest breakdown strength of 463.1 kV/cm at 1 kHz, therefore resulting in a high energy density of 5.64 J/cm3, which is about 3.9 times higher than that of the pure SrTiO3 nanowire films (1.44 J/cm3). Based on findings in this research, it was shown that improvement of dielectric properties of SrTiO3 ceramic systems can be obtained with formation of one-dimensional structures and selecting reasonable Mg content for doping.