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Deciphering driven phase transitions: a study on the dielectric and electrical properties of Ca2Fe2O5

  • Regular Article - Statistical and Nonlinear Physics
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Abstract

This study aims to contribute to the investigation of the electrical and dielectric behavior of the well-known brownmillerites Ca2Fe2O5 compound. The compound was produced using a solid-state reaction process and examined using X-ray powder diffraction and Rietveld refinement to confirm its orthorhombic crystal structure, as well as its cell characteristics. A thorough dielectric and electrical examination was carried out across a wide range of temperature and frequency, from 30 to 400 °C and 10 Hz to 1 MHz. Remarkably, at a relatively temperature of approximately 170 °C, the dielectric measurements revealed a complex behavior, indicative of diffuse phase transition. Similar distinctive changes were also observed in impedance spectroscopy and conductivity studies, suggesting a temperature like phase transition phenomenon. This observation was further substantiated through a differential scanning calorimetry analysis, which identified an endothermic dip at around 170 °C, signifying a structural disturbance at these temperatures. These findings contribute significantly to our comprehensive understanding of the material’s behavior across a wide temperature range, providing valuable insights into the polarization mechanisms, relaxation dynamics, and electrical conduction properties.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The datasets produced and/or examined in the present study can be obtained from the corresponding author upon a reasonable request.

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  1. Laboratory of Chemistry Physical Materials and Catalysis, Chemistry Department, Hassan II University of Casablanca, Faculty of Sciences Ben M’Sik, Casablanca, Morocco

    Adil Chakir, Sara Aqdim, Boubker Mehdaoui & Abdeslam El Bouari

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AC: conceptualization, characterization, analysis, interpretation, writing the original draft. SA: characterizing, analyzing, and writing the original draft. BM: analysis, interpretation and discussions, validation, revision. AEB: verification and revision of the written work.

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Chakir, A., Aqdim, S., Mehdaoui, B. et al. Deciphering driven phase transitions: a study on the dielectric and electrical properties of Ca2Fe2O5. Eur. Phys. J. B 97, 40 (2024). https://doi.org/10.1140/epjb/s10051-024-00682-8

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