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

Adil Chakir (), Sara Aqdim, Boubker Mehdaoui and Abdeslam El Bouari
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Adil Chakir: Hassan II University of Casablanca, Faculty of Sciences Ben M’Sik
Sara Aqdim: Hassan II University of Casablanca, Faculty of Sciences Ben M’Sik
Boubker Mehdaoui: Hassan II University of Casablanca, Faculty of Sciences Ben M’Sik
Abdeslam El Bouari: Hassan II University of Casablanca, Faculty of Sciences Ben M’Sik

The European Physical Journal B: Condensed Matter and Complex Systems, 2024, vol. 97, issue 4, 1-18

Abstract: 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. Graphical abstract

Date: 2024
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DOI: 10.1140/epjb/s10051-024-00682-8

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