  Structural, dielectric, ferroelectric, energy storage properties, and
electrocaloric effect were studied in lead-free ceramic
Ba$_{0.95}$Ca$_{0.05}$Ti$_{0.89}$Sn$_{0.11}$O$_3$ (BCTSn) elaborated by sol-gel
method. Phase purity structure was confirmed from X-ray data using Rietveld
refinement analysis which revealed the coexistence of tetragonal (P4mm) and
orthorhombic (Amm2) symmetries at room temperature. Phase transitions were
detected by dielectric and differential scanning calorimetry results. Energy
storage properties were determined from P-E hysteresis, and the electrocaloric
properties were calculated indirectly via the Maxwell approach. The large value
of electrocaloric temperature change of $\Delta$T=0.807 K obtained at a
relatively small field of 30 kV cm$^{-1}$ and high energy storage efficiency
can make BCTSn ceramic a promising candidate for environmentally friendly
refrigeration and energy storage applications.
