Effects of Mn doping on electrical properties of BiFeO3–SrTiO3 solid solution

30BiFeO3–70SrTiO3 ceramic is a novel dielectric material with high permittivity and a low-temperature coefficient of capacitance at high temperatures. To reduce its dielectric loss, Mn doping was performed. The relation between the doping quantity of Mn and the electrical properties of 30BiFeO3–70SrTiO3 ceramics were studied comprehensively. A general rule of Mn doping for ceramics with Fe elements is proposed. The optimized doping concentration is 1%, which reduces dielectric loss and leakage current simultaneously. Under a moderate electric field of 150 kV/cm, the energy storage density of 1% (mole) Mn-doped 30BiFeO3–70SrTiO3 is 1.86 J/cm3 and the efficiency is 0.70. These results indicate that Mn-doped 30BiFeO3–70SrTiO3 ceramic is a promising candidate for electrical energy storage applications at high temperatures. •Mn doping was used to improve the electrical properties of 0.3BiFeO3-0.7SrTiO3.•The optimized doping concentration of Mn is 1% (mole).•A general rule of Mn doping has been given.