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Enhanced Electrocaloric Effect and Energy Storage Density in Lead‐Free 0.8Na 0.5 Bi 0.5 TiO 3 ‐0.2SrTiO 3 Ceramics
Author(s) -
Kumar Ajit,
Kumar Raju,
Singh Kedar,
Singh Satyendra
Publication year - 2019
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800786
Subject(s) - electrocaloric effect , materials science , atmospheric temperature range , electric field , ceramic , energy storage , ferroelectricity , ferroelectric ceramics , range (aeronautics) , analytical chemistry (journal) , thermodynamics , optoelectronics , dielectric , chemistry , metallurgy , composite material , physics , power (physics) , chromatography , quantum mechanics
Enhanced electrocaloric response in lead‐free 0.8Na 0.5 Bi 0.5 TiO 3 ‐0.2SrTiO 3 (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 ( Δ 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 ( ζ = Δ T / Δ E ) 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.