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Issue 12, 2018

Large electrocaloric response and energy storage study in environmentally friendly (1 − x)K0.5Na0.5NbO3xLaNbO3 nanocrystalline ceramics

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Abstract

An electrocaloric material with a negative and positive electrocaloric effect (ECE) is identified to be a high potential candidate for solid-state refrigeration technology due to a changing dipolar entropy under a varying electric field. We have experimentally observed large values of negative and positive electrocaloric (EC) response in environmentally friendly (1 − x)K0.5Na0.5NbO3xLaNbO3 ceramics using Maxwell’s relationships. The maximum value of negative and positive ECE were found to be −0.88 K and 2.08 K at 50 kV cm−1 for x = 0.03. The material displays a high electrocaloric responsivity (−1.76 and 4.16 × 10−7 K m V−1 for negative and positive ECE, respectively), COP (4.16) and energy storage capacity (0.17 J cm−3) for x = 0.03. The large values of negative and positive ECE, high values of electrocaloric responsivity, COP and energy storage capacity make this compound a good candidate for electrocaloric refrigeration and high energy storage applications. The Olsen cycle is discussed to explain the process involved in using this material for electrocaloric refrigeration.

Graphical abstract: Large electrocaloric response and energy storage study in environmentally friendly (1 − x)K0.5Na0.5NbO3–xLaNbO3 nanocrystalline ceramics

Article information


Submitted
13 Jun 2018
Accepted
09 Sep 2018
First published
11 Sep 2018

Sustainable Energy Fuels, 2018,2, 2698-2704
Article type
Paper

Large electrocaloric response and energy storage study in environmentally friendly (1 − x)K0.5Na0.5NbO3xLaNbO3 nanocrystalline ceramics

R. Kumar, A. Kumar and S. Singh, Sustainable Energy Fuels, 2018, 2, 2698 DOI: 10.1039/C8SE00276B

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