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The structural, dielectric, electrocaloric, and energy storage properties of lead-free Ba0.90Ca0.10Zr0.15Ti0.85O3

Abstract : Lead-free ferroelectric materials with Electrocaloric Effect (ECE) and recoverable energy (Wrec) represent a major breakthrough in the technological race for manufacturing low-cost and eco-friendly smart multifunctional devices. Here, guided by the benefits resulting from successive ferroelectric-ferroelectric (F-F) and ferroelectricpseudo cubic (F-PC) transitions including broad operational temperature span, lead-free Ba0.90Ca0.10Zr0.15Ti0.85O3 (BCZT) ferroelectric ceramic located near the phase convergence region was prepared using the conventional solid-state solution. In this study, the systematic investigation of structural and microstructural properties via X-Ray Powder Diffraction (XRPD), scanning electron microscopy (SEM), temperature-dependence Raman spectroscopy and dielectric properties confirm the formation of a pure perovskite material which undergoes consecutive R3c-R3m, R3m-Amm2, Amm2-P4mm (F-F) phase transitions followed by (F-PC) transition in a wide temperature range centered around room temperature (RT). Polarization-Electric field (P-E) measurements, revealed the coexistence of Positive Electro-Caloric Effect (PECE) and Negative Electro-Caloric Effect (NECE) in a wide temperature span of [-40 degrees C, 95 degrees C]. More interestingly, we reached a large absolute temperature change (Delta T) and EC coefficient (xi) values of (5.505 degrees C, 1.847 KmmkV-1), (0.861 degrees C, 0.289 KmmkV-1) and (1.897 degrees C, 0.637 Kmm kV-1) registered respectively at about -5, 42.5 and 74.5 degrees C under an electric field of 29.80 kVcm- 1. This work will promote further studies on lead-free BCZT ceramics towards multifunctional environmentally-friendly material promising for solid-state cooling technology.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03627364
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Soumis le : vendredi 1 avril 2022 - 11:33:18
Dernière modification le : samedi 2 avril 2022 - 03:00:20

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Asma Dahri, Yaovi Gagou, Najmeddine Abdelmoula, Hamadi Khemakhem, Mimoun El Marssi. The structural, dielectric, electrocaloric, and energy storage properties of lead-free Ba0.90Ca0.10Zr0.15Ti0.85O3. Ceramics International, 2022, 48 (3), pp.3157-3171. ⟨10.1016/j.ceramint.2021.10.089⟩. ⟨hal-03627364⟩

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