Large electrocaloric effect in lead-free(Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 ceramics prepared via citrate route

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Abstract

The 1 wt % Li-doped (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 (BCZT-Li) ceramics prepared by the citrate method exhibit improved phase purity, densification and electrical properties, which provide prospective possibility to develop high-performance electrocaloric materials. The electrocaloric effect was evaluated by phenomenological method, and the BCZT-Li ceramics present large electrocaloric temperature change ΔT, especially large electrocaloric responsibility ξ = ΔTmax/ΔEmax, which can be comparable to the largest values reported in the lead-free piezoelectric ceramics. The excellent electrocaloric effect is considered as correlating with the coexistence of polymorphic ferroelectric phases, which are detected by the Raman spectroscopy. The large ξ value accompanied by decreased Curie temperature (around 73 °C) of the BCZT-Li ceramics prepared by the citrate method presents potential applications as the next-generation solid-state cooling devices.

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Shi, J., Zhu, R., Liu, X., Fang, B., Yuan, N., Ding, J., & Luo, H. (2017). Large electrocaloric effect in lead-free(Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 ceramics prepared via citrate route. Materials, 10(9). https://doi.org/10.3390/ma10091093

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