Correlation Between Phase Structure and Polarization of Mg Doped (ba0.98li0.02)tio3 Energy Storage Ceramics

Mg doped (Ba0.98Li0.02)TiO3 energy storage ceramics with antiferroelectric-like double hysteresis loops were prepared using solid-state reaction method. XRD patterns indicated that tetragonal phase structure of the pure (Ba0.98Li0.02)TiO3 ceramic was destroyed and the orthorhombic phase structure appeared with Mg doping. The ratio of orthorhombic/tetragonal phase increased with Mg content increasing, and the value of polarization was in direct proportion to the ratio of orthorhombic/tetragonal phase. The breakdown strength of (Ba0.98Li0.02)(MgxTi1−x)O3 ceramics was improved from 60.97 kV/cm at x = 0 to 103.66 kV/cm at x = 0.04. The optimum energy storage properties of (Ba0.98Li0.02)(MgxTi1−x)O3 ceramics were obtained with energy storage density of 0.76 J/cm3 at 102.5 kV/cm when x = 0.04, which is nearly 2.3 times larger than the pure (Ba0.98Li0.02)TiO3 ceramic, and the energy storage efficiency was improved from 64 to 87%.