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<p>Polycrystalline YFe<sub>0.5</sub>Cr<sub>0.5</sub>O<sub>3</sub> samples with a perovskite structure were prepared via a standard solid-state synthesis method. X-ray diffraction data confirmed that the compound adopts an orthorhombic crystal system with the <i>Pnma</i> space group. Scanning electron microscopy images revealed a uniform microstructure characterized by grains with an average size of approximately 1.03 μm. Evaluation of the electrical modulus further suggested the presence of a relaxation mechanism deviating from Debye-type behavior. Impedance spectroscopy indicated that the electrical properties are governed by contributions from both grains and grain boundaries. The comparable activation energies obtained for conduction and relaxation processes suggest a common origin for these mechanisms. Furthermore, the near-unity slope of the log–log plot of DC conductivity versus hopping frequency indicates that charge transport is predominantly governed by a hopping mechanism, with doubly ionized oxygen vacancies identified as the charge carriers. Scaling analyses of the electrical modulus, impedance spectroscopy, and conductivity data further reveal that both relaxation and conduction processes are invariant with temperature. Additionally, the distinct peak frequencies observed in the modulus and impedance spectra corroborate the coexistence of charge carriers exhibiting localized and non-localized conductive behavior. The fraction of charge carriers associated with localized motion increases at elevated temperatures. The sample exhibits low dielectric constants and dielectric losses at high frequencies, along with high electrical resistivity, positioning it as a suitable candidate for high-frequency applications and microwave absorption devices.</p>

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Dielectric response, impedance spectroscopy, and conduction behavior of YFe0.5Cr0.5O3 ceramics

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Q. S. Fu,
  • J. Zheng,
  • B. Meng,
  • L. C. Zheng,
  • S. L. Yuan

摘要

Polycrystalline YFe0.5Cr0.5O3 samples with a perovskite structure were prepared via a standard solid-state synthesis method. X-ray diffraction data confirmed that the compound adopts an orthorhombic crystal system with the Pnma space group. Scanning electron microscopy images revealed a uniform microstructure characterized by grains with an average size of approximately 1.03 μm. Evaluation of the electrical modulus further suggested the presence of a relaxation mechanism deviating from Debye-type behavior. Impedance spectroscopy indicated that the electrical properties are governed by contributions from both grains and grain boundaries. The comparable activation energies obtained for conduction and relaxation processes suggest a common origin for these mechanisms. Furthermore, the near-unity slope of the log–log plot of DC conductivity versus hopping frequency indicates that charge transport is predominantly governed by a hopping mechanism, with doubly ionized oxygen vacancies identified as the charge carriers. Scaling analyses of the electrical modulus, impedance spectroscopy, and conductivity data further reveal that both relaxation and conduction processes are invariant with temperature. Additionally, the distinct peak frequencies observed in the modulus and impedance spectra corroborate the coexistence of charge carriers exhibiting localized and non-localized conductive behavior. The fraction of charge carriers associated with localized motion increases at elevated temperatures. The sample exhibits low dielectric constants and dielectric losses at high frequencies, along with high electrical resistivity, positioning it as a suitable candidate for high-frequency applications and microwave absorption devices.