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<p>The properties of the new semicarbazone-based pyranoquinoline (<b>PQMHC</b>) have been analyzed in this study in terms of their structural, dielectric, electrical, and magnetic characteristics. HR-TEM and FE-SEM indicated that <b>PQMHC’s</b> morphological structures consist of well-defined nanofibrous shapes with diameters between 30 and 100 nm. Dielectric properties of <b>PQMHC</b> at frequencies of 4 Hz–8&#xa0;MHz and over a temperature range of 303–383 K reveal substantial dependence on both frequency and temperature, demonstrating that the real part of the complex dielectric constant (<i>ε</i>’) increases with temperature as a result of greater dipole polarization and decreases at high frequency due to limitations on dipole relaxation. The AC conductivity and dielectric loss show thermal activation characteristics consistent with the correlation barrier hopping (CBH) model, and this is substantiated by the temperature dependence of the frequency exponents (<i>s</i>), which decrease with temperature. Electric modulus data are indicative of a transition from long-range to localized carrier charge motion as frequency increases. Magnetic experiment results display evidence of weak ferromagnetism without saturation (maximum magnetization 0.069 emu/g, coercivity 27.937 G, and squareness ratio 0.084), suggesting that there are two poorly defined (weakly) ferromagnetic and diamagnetic regions in this compound of organic origin. The findings of this work demonstrate that <b>PQMHC</b> is a multifunctional organic semiconductor with combined dielectric, electrical, and magnetic properties, thus making it a candidate material for use in advanced electronics and spintronics.</p>

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Frequency and temperature-dependent dielectric and AC transport properties with magnetic behavior of nanostructured semicarbazone-pyranoquinoline (PQMHC)

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • A. A. El-Saady,
  • Magdy A. Ibrahim,
  • M. M. El-Nahass,
  • Omima M. I. Adly,
  • A. M. Mansour,
  • A. A. Azab,
  • A. A. M. Farag

摘要

The properties of the new semicarbazone-based pyranoquinoline (PQMHC) have been analyzed in this study in terms of their structural, dielectric, electrical, and magnetic characteristics. HR-TEM and FE-SEM indicated that PQMHC’s morphological structures consist of well-defined nanofibrous shapes with diameters between 30 and 100 nm. Dielectric properties of PQMHC at frequencies of 4 Hz–8 MHz and over a temperature range of 303–383 K reveal substantial dependence on both frequency and temperature, demonstrating that the real part of the complex dielectric constant (ε’) increases with temperature as a result of greater dipole polarization and decreases at high frequency due to limitations on dipole relaxation. The AC conductivity and dielectric loss show thermal activation characteristics consistent with the correlation barrier hopping (CBH) model, and this is substantiated by the temperature dependence of the frequency exponents (s), which decrease with temperature. Electric modulus data are indicative of a transition from long-range to localized carrier charge motion as frequency increases. Magnetic experiment results display evidence of weak ferromagnetism without saturation (maximum magnetization 0.069 emu/g, coercivity 27.937 G, and squareness ratio 0.084), suggesting that there are two poorly defined (weakly) ferromagnetic and diamagnetic regions in this compound of organic origin. The findings of this work demonstrate that PQMHC is a multifunctional organic semiconductor with combined dielectric, electrical, and magnetic properties, thus making it a candidate material for use in advanced electronics and spintronics.