#7194. Effect of Mn/Nb heterovalent substitution on the electrocaloric response and energy storage performance of Ba(Sn, Ti)O3 relaxor-ferroelectrics

January 2027publication date
Proposal available till 11-05-2025
4 total number of authors per manuscript0 $

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Journal’s subject area:
Mechanics of Materials;
Electrical and Electronic Engineering;
Materials Chemistry;
Condensed Matter Physics;
Ceramics and Composites;
Electronic, Optical and Magnetic Materials;
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Abstract:
Electrocaloric (EC) refrigeration, is accepted as an auspicious method to develop eco-friendly cooling devices. Here, the investigations on the EC response and energy storage performance of heterovalent-doped Ba(Sn, Ti)O3 relaxor ferroelectrics are carried out. Doping of aliovalent Mn or Nb elements into Ti site would regulate both the EC and energy storage behaviors. An enhanced EC temperature change up to 1.31 K, and a maximal recoverable energy storage density of 0.24 J cm? 3 with the efficiency as high as 87.11 %, can be observed under 70 kV cm? 1 in 0.5 % acceptor-doped Ba(Sn, Ti)O3 ceramics. It is found that the local internal stress, the local charge fluctuation, and the oxygen deficiencies would benefit the electrical behaviors of this system. These results would shed light on the effect of the heterovalent substitution on the electrical properties of lead-free BaTiO3 system and provide a novel and simple route to further improve the EC response and energy storage performance.
Keywords:
Electrocaloric; Energy storage; Heterovalent doping; Relaxor ferroelectrics

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