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- Title
Deciphering driven phase transitions: a study on the dielectric and electrical properties of Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub>.
- Authors
Chakir, Adil; Aqdim, Sara; Mehdaoui, Boubker; El Bouari, Abdeslam
- 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.
- Subjects
DIELECTRIC properties; PHASE transitions; RIETVELD refinement; X-ray powder diffraction; DIELECTRIC measurements; IONIC conductivity
- Publication
European Physical Journal B: Condensed Matter, 2024, Vol 97, Issue 4, p1
- ISSN
1434-6028
- Publication type
Article
- DOI
10.1140/epjb/s10051-024-00682-8