Abstract
The electrocaloric effect (EC) was investigated in the ferroelectric lead-free Gd0.02Na0.5Bi0.48TiO3 (GdNBT) ceramics. A pure perovskite structure was observed by the X-ray diffraction in GdNBT ceramics synthesized by a solid-state reaction method. Dielectric measurements revealed the existence of different ferroelectric and antiferroelectric transformations in this material. Based on the temperature dependence of P–E loops, reversible electrocaloric temperature changes of about ΔT = 0.75 K at the electric field of 90 kV/cm and the EC responsivity ΔT/ΔE ≈ 0.08 × 10−6 K m V−1 were obtained in the GdNBT ceramics. The energy-storage density W = 0.85 J cm−3 and the associated efficiency (η= 65%) at 413 K were determined from the P-E loops data. The simultaneous existence of EC responsivity and energy-storage density makes GdNBT very promising lead-free material and opens a great potential for its application in electronic devices.
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