The Re0.02Sr0.98TiO3 (ReST, Re = La, Pr, Sm) ceramics with single cubic perovskite structures were prepared by a solid state reaction method. The structure and dielectric properties of the ReST ceramics were investigated for energy storage capacitor applications. Strongly improved dielectric constant (εr > 2000 @1 kHz) with a good bias electric field stability was achieved for the ReST ceramics. Together with relatively low dielectric loss (tanδ ≤ 3% @1 kHz) and normally high breakdown strength (Eb > 15 kV/mm), the ReST ceramics should be very promising for energy storage capacitors in pulsed power electronics.

Keywords: Dielectric ceramics, Strontium titanate, Rare earth doping, Energy storage.