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A Giant Electrocaloric Effect in Nanoscale Antiferroelectric and Ferroelectric Phases Coexisting in a Relaxor Pb0.8Ba0.2ZrO3 Thin Film at Room Temperature

Authors

  • Biaolin Peng,

    1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
    2. Department of Manufacturing and Materials, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK
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  • Huiqing Fan,

    Corresponding author
    1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
    • State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
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  • Qi Zhang

    Corresponding author
    1. Department of Manufacturing and Materials, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK
    • Department of Manufacturing and Materials, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK.
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Abstract

Recently, large electrocaloric effects (ECE) in antiferroelectric sol-gel PbZr0.95Ti0.05O3 thin films and in ferroelectric polymer P(VDF-TrFE)55/45 thin films were observed near the ferroelectric Curie temperatures of these materials (495 K and 353 K, respectively). Here a giant ECE (ΔT = 45.3 K and ΔS = 46.9 J K−1 kg−1 at 598 kV cm−1) is obtained in relaxor ferroelectric Pb0.8Ba0.2ZrO3 (PBZ) thin films fabricated on Pt(111)/TiOx/SiO2/Si substrates using a sol-gel method. Nanoscale antiferroelectric (AFE) and ferroelectric (FE) phases coexist at room temperature (290 K) rather than at the Curie temperature (408 K) of the material. The giant ECE in such a system is attributed to the coexistence of AFE and FE phases and a field-induced nanoscale AFE to FE phase transition. The giant ECE of the thin film makes this a promising material for applications in cooling systems near room temperature.

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