Probing the multifunctional behaviour of barium zirconate/barium titanate/epoxy resin hybrid nanodielectrics
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Probing the multifunctional behaviour of barium zirconate/barium titanate/epoxy resin hybrid nanodielectrics Z. M. Tsikriteas1 · G. C. Manika1,2 · A. C. Patsidis1 · G. C. Psarras1 Received: 30 August 2019 / Accepted: 16 May 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract In this study, hybrid composite nanodielectrics of epoxy resin and B aZrO3/BaTiO3 ceramic nanoparticles were prepared via a mixing process varying the filler content. Composites’ morphology was studied via scanning electron microscopy, and in all cases, fine nanodispersions were detected. The electrical response of the employed nanofillers, as well as of the produced hybrid composite specimens, was examined by means of broadband dielectric spectroscopy in a wide temperature and frequency range. The thermally varying polarization of the embedded nanoparticles induces functionality to the prepared aTiO3. Aiming to investigate these composite systems, due to the thermally triggered structural transitions of BaZrO3 and B structural transitions, samples were studied by means of X-Ray diffraction with temperature as a parameter. Finally, the ability of the examined nanosystems to store and harvest energy under various conditions was determined and discussed in tandem with the mutual interactions of the occurring physical mechanisms at specific temperature ranges. Keywords Ferroelectrics · Dielectric relaxation · Energy storage · Multifunctionality
Introduction Lately, materials with high dielectric constant (or in other words real part of dielectric permittivity) attracted research attention worldwide, because of their huge potential applicability as high energy density capacitors. This kind of capacitors is of great importance for a wide range of applications in modern electronics and electrical power systems such as hybrid electric vehicle (HEV). The major advantage of high energy density capacitors is their high-power density due to the fast charge and discharge capability. In an effort to increase further the energy storage ability of capacitors, some critical properties of dielectric materials including high dielectric constant and low dielectric loss are desired. However, traditional dielectrics, such as organic polymers and inorganic ceramics, fail to meet the rigorous * G. C. Psarras [email protected] 1
Smart Materials and Nanodielectrics Laboratory, Department of Materials Science, University of Patras, 26504 Patras, Greece
Department of Industrial and Materials Science, Division of Engineering Materials, Chalmers University of Technology, SE‑41296, Gothenburg, Sweden
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requirements of advanced capacitors. On the one hand, organic polymers have low dielectric constant and high energy density can be achieved only at high applied electric fields. On the other hand, the application of high dielectric constant ceramic in electronic devices is also limited due to their apparent disadvantages including brittleness and low breakdown strength. In order to overcome the disadvantages occurring from both polymers and ceramic
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