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Abstract <p>The powder sample of LaFeO<sub>3</sub> was prepared using the popular solid-state reaction method. XRD study of the sample indicated the orthorhombic structure with space group <i>Pbnm</i>, and the volume of the compound was determined to be 240.38 Å<sup>3</sup>. The value of microstrain was found to be 1.13 × 10<sup>–3</sup> from the Williamson–Hall (W–H) plot of the sample, and the average grain size was found to be ~270 nm from the&#xa0;SEM picture. UV absorption spectroscopy was employed to study the optical behaviour of the sample in the wavelength range of 200–800 nm. The electrical conductance behaviour of the sample was carried out by an impedance analyzer. The perovskite structure as well as NTCR behaviour allows the sample for efficient hopping of charge carriers between Fe ions, which contributes to its thermistor behaviour. The ac conductivity of the sample was explained in accordance with the Arrhenius equation as well as Jonscher power law. The measured activation energy was found to lie between 0.84 to 1.14 eV in the temperature range 233 to 578 K and 2.33 to 3.88 eV than that of 578–653 K. The density of states (DOS) was found to increase slowly with an increase in temperature up to 793 K; after that, it increased rapidly with the increase in temperature, while at the low frequency, it was very high and decreased gradually with frequency for all temperature ranges. The electrical conduction mechanism was explained using the QMT (Quantum mechanical tunnelling) model.</p>

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Exploring the Impedance and Electrical Conduction Mechanisms in LaFeO3 Orthoferrites for Thermistor Applications

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Prafulla Kumar Pradhan,
  • N. K. Mohanty,
  • A. B. Panda,
  • G. K. Mishra,
  • Lalatendu Biswal

摘要

Abstract

The powder sample of LaFeO3 was prepared using the popular solid-state reaction method. XRD study of the sample indicated the orthorhombic structure with space group Pbnm, and the volume of the compound was determined to be 240.38 Å3. The value of microstrain was found to be 1.13 × 10–3 from the Williamson–Hall (W–H) plot of the sample, and the average grain size was found to be ~270 nm from the SEM picture. UV absorption spectroscopy was employed to study the optical behaviour of the sample in the wavelength range of 200–800 nm. The electrical conductance behaviour of the sample was carried out by an impedance analyzer. The perovskite structure as well as NTCR behaviour allows the sample for efficient hopping of charge carriers between Fe ions, which contributes to its thermistor behaviour. The ac conductivity of the sample was explained in accordance with the Arrhenius equation as well as Jonscher power law. The measured activation energy was found to lie between 0.84 to 1.14 eV in the temperature range 233 to 578 K and 2.33 to 3.88 eV than that of 578–653 K. The density of states (DOS) was found to increase slowly with an increase in temperature up to 793 K; after that, it increased rapidly with the increase in temperature, while at the low frequency, it was very high and decreased gradually with frequency for all temperature ranges. The electrical conduction mechanism was explained using the QMT (Quantum mechanical tunnelling) model.