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<p>Chromium(III) oxide (Cr₂O₃) nanoparticles have attracted considerable interest for dielectric and electronic applications because nanoscale dimensions significantly influence polarization, charge transport, and magnetic behavior. However, existing studies have provided limited understanding of the relationship between defect-assisted dielectric relaxation, frequency-dependent conduction, and magnetic properties in pure Cr₂O₃ nanoparticles. This study systematically investigates the magnetic, morphological, dielectric, structural, and electrical characteristics of chemically synthesized Cr₂O₃ nanoparticles with an average particle size of 25&#xa0;nm. Nanoparticles were prepared by the chemical co-precipitation method followed by controlled calcination and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), SQUID magnetometry, and an LCR impedance analyzer over 20&#xa0;Hz–1&#xa0;MHz and 20–350&#xa0;K. The nanoparticles exhibited a rhombohedral crystalline structure, nearly spherical morphology, enhanced dielectric permittivity, thermally activated non-Debye dielectric relaxation, and frequency-dependent AC conductivity governed by defect-assisted hopping. An activation energy of 0.071&#xa0;eV, substantially lower than the 0.350&#xa0;eV observed for bulk Cr₂O₃, indicates improved charge transport through grain-boundary and oxygen-vacancy-related localized states. The combined structural, magnetic, and dielectric analyses demonstrate the potential of pure Cr₂O₃ nanoparticles for dielectric components, sensors, and advanced electronic devices while providing a foundation for future optimization through composite systems.</p>

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Enhanced dielectric response and thermally activated charge transport in co-precipitated nanostructured chromium oxide systems

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月31日

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  • Aele Manohar,
  • K. Suresh Babu,
  • Nagarjuna Rao Mamidipalli,
  • Papireddy Tiyyagura,
  • Raju Vidap

摘要

Chromium(III) oxide (Cr₂O₃) nanoparticles have attracted considerable interest for dielectric and electronic applications because nanoscale dimensions significantly influence polarization, charge transport, and magnetic behavior. However, existing studies have provided limited understanding of the relationship between defect-assisted dielectric relaxation, frequency-dependent conduction, and magnetic properties in pure Cr₂O₃ nanoparticles. This study systematically investigates the magnetic, morphological, dielectric, structural, and electrical characteristics of chemically synthesized Cr₂O₃ nanoparticles with an average particle size of 25 nm. Nanoparticles were prepared by the chemical co-precipitation method followed by controlled calcination and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), SQUID magnetometry, and an LCR impedance analyzer over 20 Hz–1 MHz and 20–350 K. The nanoparticles exhibited a rhombohedral crystalline structure, nearly spherical morphology, enhanced dielectric permittivity, thermally activated non-Debye dielectric relaxation, and frequency-dependent AC conductivity governed by defect-assisted hopping. An activation energy of 0.071 eV, substantially lower than the 0.350 eV observed for bulk Cr₂O₃, indicates improved charge transport through grain-boundary and oxygen-vacancy-related localized states. The combined structural, magnetic, and dielectric analyses demonstrate the potential of pure Cr₂O₃ nanoparticles for dielectric components, sensors, and advanced electronic devices while providing a foundation for future optimization through composite systems.