Large electrocaloric effect in BiScO3 doped K0.5Na0.5NbO3 ceramics

Exploring an electrocaloric (EC) material with a large electrocaloric effect (ECE) value is of high interest and importance to realize a solid-state cooling solution. We have investigated the electrocaloric performance and energy storage density in lead-free (1-x) K 0.5 Na 0.5 NbO 3 -x BiScO 3 (KNN-xBS) ferroelectric ceramics. The KNN-xBS (x = 0.01, 0.02, 0.03, and 0.10) ceramics were synthesized by the typical solid-state route and ECE was examined by an indirect method based on Maxwell’s relations. The maximum value of ECE has obtained 0.61 K at 428 K for 60 kV/cm applied field, and the recoverable energy density has 0.57 J/ cm 3 for x = 0.01 ceramics. The obtained positive ECE has a larger value among different lead-free ceramics. The BiScO 3 doped K 0.5 Na 0.5 NbO 3 ceramics have presented enormous potential in solid-state cooling technology for a cleaner environment.