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arXiv · 2012.12750

Enhancing the dielectric, electrocaloric and energy storage properties of lead-free Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramics prepared via sol-gel process

H. Mezzourh·S. Belkhadir·D. Mezzane·M. Amjoud·E. Choukri·A. Lahmar·Y. Gagou·Z. Kutnjak·M. El Marssi
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Abstract

The Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) ceramics were successfully prepared by sol-gel process, and sintered at 1420 degree. The effect of sintering times (2, 4 and 6 h) on structural, microstructural, electric properties, energy storage, and electrocaloric effect was systematically examined. X-ray diffraction (XRD) results show that all the samples crystallize in the pure perovskite structure. The morphotropic phase transition from the tetragonal to the orthorhombic phase (T-O) was identified and confirmed by Rietveld refinement. The BCZT ceramic sintered at 1420 degree for 4h possesses a good relative density of 98%, and exhibits optimal properties with a high dielectric permittivity ~16310, a large electrocaloric effect coefficient ~ 0.244Kmm/kV and an energy density storage of ~ 10.61 mJ/cm3.

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H. Mezzourh, S. Belkhadir, D. Mezzane, M. Amjoud, E. Choukri, A. Lahmar, Y. Gagou, Z. Kutnjak, M. El Marssi. 2020-12-23. Enhancing the dielectric, electrocaloric and energy storage properties of lead-free Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramics prepared via sol-gel process. https://doi.org/10.1016/j.physb.2020.412760

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