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  • Title: Thermally-stable high energy storage performances and large electrocaloric effect over a broad temperature span in lead-free BCZT ceramic.
    Author: Hanani Z, Merselmiz S, Mezzane D, Amjoud M, Bradeško A, Rožič B, Lahcini M, El Marssi M, Ragulya AV, Luk'yanchuk IA, Kutnjak Z, Gouné M.
    Journal: RSC Adv; 2020 Aug 17; 10(51):30746-30755. PubMed ID: 35516015.
    Abstract:
    Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) relaxor ferroelectric ceramics exhibit enhanced energy storage and electrocaloric performances due to their excellent dielectric and ferroelectric properties. In this study, the temperature-dependence of the structural and dielectric properties, as well as the field and temperature-dependence of the energy storage and the electrocaloric properties in BCZT ceramics elaborated at low-temperature hydrothermal processing are investigated. X-ray diffraction and Raman spectroscopy results confirmed the ferroelectric-paraelectric phase transition in the BCZT ceramic. At room temperature and 1 kHz, the dielectric constant and dielectric loss reached 5000 and 0.029, respectively. The BCZT ceramic showed a large recovered energy density (W rec) of 414.1 mJ cm-3 at 380 K, with an energy efficiency of 78.6%, and high thermal-stability of W rec of 3.9% in the temperature range of 340-400 K. The electrocaloric effect in BCZT was explored via an indirect approach following the Maxwell relation at 60 kV cm-1. The significant electrocaloric temperature change of 1.479 K at 367 K, a broad temperature span of 87 K, an enhanced refrigerant capacity of 140.33 J kg-1, and a high coefficient of performance of 6.12 obtained at 60 kV cm-1 make BCZT ceramics potentially useful coolant materials in the development of future eco-friendly solid-state refrigeration technology.
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