Mn2+掺杂对0.94Bi0.5Na0.5TiO3–0.06BaTiO3陶瓷储能性能的影响

The Mn 2+ -doped 0.94Bi 0.5 Na 0.5 Ti (1− x ) Mn x O 3 -0.06BaTiO 3 (BNTM x -BT, x = 0.00 ~ 0.06) system was prepared by the conventional solid-state method. The XPS results showed that some of the Mn 2+ doped into the BNT-BT ceramics were transformed into higher valence states of Mn 3+ and Mn 4+ , which led to an increase in the adsorbed oxygen content in the ceramics and a decrease in the concentration of the oxygen vacancies. Accordingly, the leakage current in the ceramics is steeply decreased by the doping of Mn 2+ . The dielectric temperature spectrum exhibited that the doping of Mn 2+ weakened the T s dielectric peak and caused the T m peak to exhibit a more significantly frequency dispersion, which were conducive to the enhancement of the relaxation properties of the ceramics. The ceramics sintered at 1125 °C obtained a better storage performance at x = 0.03 ( W rec = 0.51 J/cm 3 , η = 39.74%).