Energy Storage Properties of Mn and Y Codoped Ba_0.67Sr_0.33TiO₃ Ceramics

Ba_0.67-xY_xSr_0.33Ti_0.995Mn_0.005O₃ (BSTM-xY, x = 0, 0.003, 0.006, and 0.012) ceramics are synthesized by citrate sol–gel methods and the effect of Y contents on the energy storage properties of BSTM-xY ceramics is investigated. Dense microstructures with fine grain are observed as Mn and Y codoping. The introduction of Y enhances the dielectric properties and leakage current density of BSTM-xY ceramics. Mn and Y codoped BST ceramics show enhanced energy storage properties due to the improved microstructure and “slimmer” hysteresis loops with high polarization. The energy efficiency presents good thermal stability and electric field stability as Y doping. The energy density of BSTM-0.012Y ceramic is about 4 times larger than BSTM ceramic. The energy efficiency of BSTM-0.012Y ceramic maintains at about 91% at the field range of 30–150 kV cm⁻¹ and at the temperature range of 20–50 °C.