HANANI, Zouhair; MERSELMIZ, Soukaina; DANINE, Abdelaadim; STEIN, Nicolas; MEZZANE, Daoud; AMJOUD, M’barek; LAHCINI, Mohammed; GAGOU, Yaovi; SPREITZER, Matjaz; VENGUST, Damjan; KUTNJAK, Zdravko; EL MARSSI, Mimoun; LUK'YANCHUK, Igor A.; GOUNÉ, Mohamed

doi:10.1007/s40145-020-0361-1

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HANANI, Zouhair
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire des Matériaux Innovants, Energie et Développement Durable [Marrakech] [IMED-Lab]

MERSELMIZ, Soukaina
Laboratoire des Matériaux Innovants, Energie et Développement Durable [Marrakech] [IMED-Lab]

DANINE, Abdelaadim
Institut Jean Lamour [IJL]

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Journal of Advanced Ceramics. 2020-04, vol. 9, n° 2, p. 210-219

Résumé en anglais

Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) lead-free ceramics demonstrated excellent dielectric, ferroelectric, and piezoelectric properties at the morphotropic phase boundary (MPB). So far, to study the effect of morphological changes on dielectric and ferroelectric properties in lead-free BCZT ceramics, researchers have mostly focused on the influence of spherical grain shape change. In this study, BCZT ceramics with rod-like grains and aspect ratio of about 10 were synthesized by surfactant-assisted solvothermal route. X-ray diffraction (XRD) and selected area electron diffraction (SAED) performed at room temperature confirm the crystallization of pure perovskite with tetragonal symmetry. Scanning electron microscopy (SEM) image showed that BCZT ceramics have kept the 1D rod-like grains with an average aspect ratio of about 4. Rod-like BCZT ceramics exhibit enhanced dielectric ferroelectric (ɛr = 11,906, tanδ = 0.014, Pr = 6.01 μgC/cm2, and Ec = 2.46 kV/cm), and electrocaloric properties (ΔT = 0.492 K and gZ = 0.289 (K·mm)/kV at 17 kV/cm) with respect to spherical BCZT ceramics. Therefore, rod-like BCZT lead-free ceramics have good potential to be used in solid-state refrigeration technology.< Réduire

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Enhanced dielectric and electrocaloric properties in lead-free rod-like BCZT ceramics

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