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<p>This work reports on the fabrication of polymer-ceramic multiferroic composites, PVDF-Bi₁₋ₓDyₓFeO₃ [with x = 0.05 (PVDF-BDFO5), 0.10 (PVDF-BDFO10), and 0.15 (PVDF-BDFO15)] (PVDF-BDFO), through a solution casting route. X-ray diffraction (XRD) analysis demonstrates the determination of all three polymorphic phases (α-, β- and γ-) of PVDF and unit cell parameters and the fundamental crystal structure of the crystalline phase. Structural analysis typically reveals that Dy-substitution at the Bi site stabilizes the rhombohedral perovskite structure of BiFeO₃. When incorporated into the PVDF matrix, the ceramic particles promote the nucleation of the β-phase of PVDF, which is responsible for strong electrical response. Electrical characterization of PVDF-BDFO ceramic composites improves dielectric constant, reduces leakage current, due to enhanced polarization and interfacial effects, though very high doping may eventually stabilize or slightly reduce it due to defects. The filler particles BDFO have been uniformly distributed throughout the polymer matrix, as observed using the scanning electron microscopy (SEM) technique. To investigate the impact of grain structure and grain boundaries on the resistive characteristics of the composite materials in terms of electric circuits, a complex impedance spectroscopy (CIS) technique was used. This suggests that these flexible fibers could be used for a variety of applications, including sensors, spintronic devices, and flexible information storage.</p>

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Development of Structural and Electrical Properties in PVDF-Bi1−xDyₓFeO₃ Ceramic Composites

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • Samita Pattanayak,
  • R. N. P. Choudhary

摘要

This work reports on the fabrication of polymer-ceramic multiferroic composites, PVDF-Bi₁₋ₓDyₓFeO₃ [with x = 0.05 (PVDF-BDFO5), 0.10 (PVDF-BDFO10), and 0.15 (PVDF-BDFO15)] (PVDF-BDFO), through a solution casting route. X-ray diffraction (XRD) analysis demonstrates the determination of all three polymorphic phases (α-, β- and γ-) of PVDF and unit cell parameters and the fundamental crystal structure of the crystalline phase. Structural analysis typically reveals that Dy-substitution at the Bi site stabilizes the rhombohedral perovskite structure of BiFeO₃. When incorporated into the PVDF matrix, the ceramic particles promote the nucleation of the β-phase of PVDF, which is responsible for strong electrical response. Electrical characterization of PVDF-BDFO ceramic composites improves dielectric constant, reduces leakage current, due to enhanced polarization and interfacial effects, though very high doping may eventually stabilize or slightly reduce it due to defects. The filler particles BDFO have been uniformly distributed throughout the polymer matrix, as observed using the scanning electron microscopy (SEM) technique. To investigate the impact of grain structure and grain boundaries on the resistive characteristics of the composite materials in terms of electric circuits, a complex impedance spectroscopy (CIS) technique was used. This suggests that these flexible fibers could be used for a variety of applications, including sensors, spintronic devices, and flexible information storage.