Abstract
Enhanced electrocaloric response in lead‐free 0.8Na0.5Bi0.5TiO3‐0.2SrTiO3 (NBT‐0.2ST) ceramics are investigated using an indirect approach based on Maxwell's relations over a wide operating temperature range. The electrocaloric effect (ECE) is obtained over a broad temperature range with the maximum temperature change (T) value reaching 0.75 K at the working temperature of 400 K under the electric field of 35 kV cm−1. The maximum EC coefficient () is found to be 0.022 K·cm kV−1 at 400 K. Energy storage density of NBT‐0.2ST are calculated and found to be 0.36 J cm−3 at 393 K. High value of ECE and a wide working temperature range (350–450 K) make it a promising lead‐free ferroelectric material for applications in cooling technologies.
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