Thermally-stable high energy storage performances and large electrocaloric effect over a broad temperature span in lead-free BCZT ceramic. Issue 51 (20th August 2020)

• Record Type: Journal Article
• Authors: Hanani, Zouhair; Merselmiz, Soukaina; Mezzane, Daoud; Amjoud, M'barek; Bradeško, Andraž; Rožič, Brigita; Lahcini, Mohammed; El Marssi, Mimoun; Ragulya, Andrey V.; Luk'yanchuk, Igor A.; Kutnjak, Zdravko; Gouné, Mohamed
• Is Part Of: RSC advances. Volume 10:Issue 51(2020)
• Page Start: 30746
• Page End: 30755
• Publication Date: 2020-08-20
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra06116f
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Thermally-stable recovered energy density and significant electrocaloric temperature change over a broad temperature span in BCZT ceramic elaborated by low-temperature hydrothermal processing. Abstract : Ba0.85 Ca0.15 Zr0.10 Ti0.90 O3 (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.