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The improvement of the electrocaloric effect (ECE) in (1−x)(Na0.5Bi0.5)TiO3−xSrTiO3 (NBT-ST) lead-free relaxor ferroelectric ceramics was determined by indirect measurements method and is reported here. The phase transition temperature can be reduced to room temperature by tuning the compositions of the (1−x)NBT-xST material. A large ECE (ΔTmax=1.64K, ΔSmax=2.52K and ΔT/ΔE=0.33KmmkV−1 at 50kVcm−1)...
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