Enhanced thermal stability of dielectric and energy storage properties in 0.4BCZT-0.6BTSn lead-free ceramics elaborated by sol-gel method

Polycrystalline lead-free Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT), BaTi0.89Sn0.11O3 (BTSn) and 0.4Ba0.85Ca0.15Zr0.10Ti0.90O3–0.6BaTi0.89Sn0.11O3 (0.4BCZT–0.6BTSn) ferroelectric ceramics were prepared via sol-gel process and their structural, dielectric and energy storage properties were studied. Pure perovskite structure was confirmed by X-ray diffraction analysis. The evolution of energy storage performances with temperature was studied. A Significant recoverable energy-storage density of 137.86 mJ/cm3 and high energy-storage efficiency of 86.19% under a moderate electric field of 30 kV/cm were achieved in the composite 0.4BCZT–0.6BTSn ceramic at 353 K. Moreover, excellent temperature stability (70–130 °C) of the energy storage efficiency (less than 3%) was achieved.