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<p>The development of polymer nanocomposites (PNCs) has grown due to the growing need for flexible, lightweight, and high energy-density dielectric materials for electronics applications. In this study, Nb-doped Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub> (CFNO) ceramic nanofillers were synthesized via a conventional solid-state reaction route and subsequently incorporated into a high-performance PVDF/PMMA polymer blend using the solvent casting technique. The morphological analyses confirmed the successful dispersion of CFNO nanofillers in the polymer matrix, with improved electroactive β-phase. The optical analysis shows a reduction in band gap energy from 4.11&#xa0;eV to 1.06&#xa0;eV, consistent with the semiconductor hypothesis. According to the melting curves, the 10 wt% composite exhibits a characteristic peak at about 150&#xa0;°C, and the overall percentage crystallinity (X<sub>c</sub>) is 18.85%. The maximum dielectric constant achieved is nearly 26.22 at 100&#xa0;Hz with the addition of 15 wt% nanofiller, roughly 3.5 times that of the pure blend. According to impedance spectroscopy, the grain effect predominates over the grain boundaries and exhibits non-Debye type relaxation behaviour. The energy density increases from 0.28 to 1.07&#xa0;J cm<sup>− 3</sup> at 15 wt% with 74.50% efficiency, due to enhanced interfacial polarization, improved dipole alignment, and microcapacitor formation from the high-k ceramic nanoparticle (NPs). These results show that PVDF/PMMA/CFNO nanocomposites are promising materials for high-performance dielectric applications.</p>

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Optimizing Ca2FeNbO6 filler for enhanced polarization and energy density in PVDF/PMMA ferroelectric composites

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Ayashkanta Nanda,
  • Nitesh Kumar Nath,
  • Rajanikanta Parida,
  • Bichitra Nanda Parida,
  • Dhwnbir Basumatary,
  • Nimai C. Nayak

摘要

The development of polymer nanocomposites (PNCs) has grown due to the growing need for flexible, lightweight, and high energy-density dielectric materials for electronics applications. In this study, Nb-doped Ca2Fe2O5 (CFNO) ceramic nanofillers were synthesized via a conventional solid-state reaction route and subsequently incorporated into a high-performance PVDF/PMMA polymer blend using the solvent casting technique. The morphological analyses confirmed the successful dispersion of CFNO nanofillers in the polymer matrix, with improved electroactive β-phase. The optical analysis shows a reduction in band gap energy from 4.11 eV to 1.06 eV, consistent with the semiconductor hypothesis. According to the melting curves, the 10 wt% composite exhibits a characteristic peak at about 150 °C, and the overall percentage crystallinity (Xc) is 18.85%. The maximum dielectric constant achieved is nearly 26.22 at 100 Hz with the addition of 15 wt% nanofiller, roughly 3.5 times that of the pure blend. According to impedance spectroscopy, the grain effect predominates over the grain boundaries and exhibits non-Debye type relaxation behaviour. The energy density increases from 0.28 to 1.07 J cm− 3 at 15 wt% with 74.50% efficiency, due to enhanced interfacial polarization, improved dipole alignment, and microcapacitor formation from the high-k ceramic nanoparticle (NPs). These results show that PVDF/PMMA/CFNO nanocomposites are promising materials for high-performance dielectric applications.