Dielectric and temperature stable energy storage properties of 0.88BaTiO3–0.12Bi(Mg1/2Ti1/2)O3 bulk ceramics

• 0.88BaTiO3–0.12Bi(Mg1/2Ti1/2)O3 ceramics were prepared by solid state method.
• Dielectric properties show relaxor-like behavior and weak temperature-dependence.
• A field-induced phase transition from relaxor state to “FE” state can be detected.
• High breakdown strength and temperature stable energy density were obtained.

The 0.88BaTiO3–0.12Bi(Mg1/2Ti1/2)O3 ceramics were prepared via the solid state reaction route. The temperature dependence of permittivity in 0.88BaTiO3–0.12Bi(Mg1/2Ti1/2)O3 (0.88BT–0.12BMT) ceramics shows relaxor-like behavior and weak temperature-dependence over a temperature range from −50 °C to 100 °C at 100 Hz. The polarization–electric field hysteresis (P–E) loops display a linear behavior at low fields, and slight saturated nonlinear behaviors at higher fields. It can be inferred from the polarization behavior at high fields that a field-induced phase transition from relaxor state to ferroelectric state can be detected. Energy storage performance at different temperatures was also studied. The maximum energy storage density of 1.81 J/cm2 was obtained at room temperature. And, a temperature stable energy storage property of the 0.88BT–0.12BMT over a temperature range from −50 °C to 120 °C suggests its potential application in energy storage capacitors.