Abstract
Pb0.8Ba0.2ZrO3 (PBZ) nanofibers were prepared through electrospinning and mixed at a volume composite ratio of 0–6% with polyvinylidene fluoride (PVDF) dissolved in an organic solvent, and the PBZ/PVDF composite film was prepared through casting. The nanocomposites with PBZ nanofibers of 3 vol% showed the best ferroelectric performance in this work, and the maximum polarization value and breakdown field strength were 9.69 μC/cm2 and 420 MV/m, respectively. The dielectric constant and dielectric loss at a depolarization temperature of 285 K were 6.13 and 0.21, respectively. The performance of the electrocaloric effect was studied using the direct method near room temperature. Under 150 MV/m and − 30 °C, the △T and ΔS of the composite film were 13.99 K and 52.70 J/kg K, respectively. When the temperature increased to 70 °C, △T and ΔS become 5.08 K and 13.56 J/kg K, respectively. The simulation results and experiments indicate that the incorporation of nanofibers can increase the interface polarization with higher polarization value and improve the ferroelectric performance than pure PVDF.
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Acknowledgements
This work was supported by the National Nature Science Foundation of China (NSFC No. 51672130), the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (Nanjing University of Aeronautics and astronautics) (Grant No. MCMS-0518K01), the Key Research and Development Program of Jiangsu Province (Grant No. BE2018008-2), and the Fundamental Research Funds for the Central Universities (No. NP2020101 and NS2020007), a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Qian, G., Zhu, K., Li, X. et al. The electrocaloric effect of PBZ/PVDF flexible composite film near room temperature. J Mater Sci: Mater Electron 32, 12001–12016 (2021). https://doi.org/10.1007/s10854-021-05831-8
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DOI: https://doi.org/10.1007/s10854-021-05831-8