HANANI, Zouhair; MERSELMIZ, Soukaina; MEZZANE, Daoud; AMJOUD, M'Barek; BRADEŠKO, Andraž; ROŽIČ, Brigita; LAHCINI, Mohammed; EL MARSSI, Mimoun; RAGULYA, Andrey; LUK'YANCHUK, Igor A.; KUTNJAK, Zdravko; GOUNÉ, Mohamed

doi:10.1039/D0RA06116F

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HANANI, Zouhair
Université Cadi Ayyad [Marrakech] [UCA]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

MERSELMIZ, Soukaina
Université Cadi Ayyad [Marrakech] [UCA]

MEZZANE, Daoud
Université Cadi Ayyad [Marrakech] [UCA]

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RSC Advances. 2020-08-20, vol. 10, n° 51, p. 30746-30755

Royal Society of Chemistry

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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 (Wrec) of 414.1 mJ cm−3 at 380 K, with an energy efficiency of 78.6%, and high thermal-stability of Wrec 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.< Réduire

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Thermally-stable high energy storage performances and large electrocaloric effect over a broad temperature span in lead-free BCZT ceramic

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