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

30BiFeO(3)-70SrTiO(3) 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 30BiFeO(3)-70SrTiO(3) 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 30BiFeO(3)-70SrTiO(3) is 1.86 J/cm(3) and the efficiency is 0.70. These results indicate that Mn-doped 30BiFeO(3)-70SrTiO(3) ceramic is a promising candidate for electrical energy storage applications at high temperatures.