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- Title
Large Electrocaloric Responsivity and Energy Storage Response in the Lead-Free Ba(Ge x Ti 1− x)O 3 Ceramics.
- Authors
Asbani, Bouchra; Gagou, Yaovi; Ben Moumen, Said; Dellis, Jean-Luc; Lahmar, Abdelilah; Amjoud, M'Barek; Mezzane, Daoud; El Marssi, Mimoun; Rozic, Brigita; Kutnjak, Zdravko
- Abstract
Ferroelectric property that induces electrocaloric effect was investigated in Ba(GexTi1−x)O3 ceramics, known as BTGx. X-ray diffraction analysis shows pure perovskite phases in tetragonal symmetry compatible with the P4mm (No. 99) space group. Dielectric permittivity exhibits first-order ferroelectric-paraelectric phase transition, confirmed by specific heat measurements, similar to that observed in BaTiO3 (BTO) crystal. Curie temperature varies weakly as a function of Ge-content. Using the direct and indirect method, we confirmed that the adiabatic temperature change ΔT reached its higher value of 0.9 K under 8 kV/cm for the composition BTG6, corresponding to an electrocaloric responsivity ΔT/ΔE of 1.13 × 10−6 K.m/V. Such electrocaloric responsivity significantly exceeds those obtained so far in other barium titanate-based lead-free electrocaloric ceramic materials. Energy storage investigations show promising results: stored energy density of ~17 mJ/cm3 and an energy efficiency of ~88% in the composition BTG5. These results classify the studied materials as candidates for cooling devices and energy storage applications.
- Subjects
LEAD-free ceramics; ENERGY storage; FIRST-order phase transitions; PYROELECTRICITY; CERAMIC materials; CERAMICS; BARIUM titanate
- Publication
Materials (1996-1944), 2022, Vol 15, Issue 15, p5227
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma15155227