Structural, dielectric, and electrical transport properties of La2FeMnO6 double perovskite for multifunctional applications
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Date
2024
Authors
Journal Title
Ceramics International
Journal ISSN
Volume Title
Publisher
Elsevier Ltd
Abstract
The polycrystalline La2FeMnO6 has been prepared by the solid-state reaction method. The Rietveld refinement of X-ray diffraction (XRD) data confirms a single-phase double perovskite cubic structure. The vibrational modes have been investigated by the Raman and Fourier transform infrared (FTIR) spectroscopy. The X-ray photoemission spectroscopy (XPS) measurement reveals the presence of mixed valence states of Mn and Fe cations. The dielectric, impedance, modulus, and AC conductivity measurements of La2FeMnO6 have been done over temperature range (125�300 K) and frequencies (1 kHz - 1 MHz). This material exhibits a high ?? (?1826) with a low dissipation factor near room temperature. The NTCR (negative temperature coefficient of resistance) characteristics of both resistivity and impedance showed the semiconducting nature of the sample. Grains and grain- boundaries play important role in the process of electrical conduction. The Cole-Cole plots follow the RC equivalent circuit and verify non-Debye-type relaxation. The value of the exponent �s� suggests the non-overlapping small polaron tunneling (NSPT) process in La2FeMnO6. The NTCR characteristic of this material, with good stability factor, thermistor constant, and sensitivity factor may be useful for NTC-type thermistor. � 2024
Description
Keywords
Complex magnetism, Dielectric spectroscopy, Impedance spectroscopy, Leakage-current density, NTC thermistor, Rietveld refinement