Investigation of the structural, electrical, and dielectric properties of La0.5Sm0.2Sr0.3Mn1- x Cr x O3 for electrical application

Khouloud Abdouli; F Hassini; W Cherif; P R Prezas; M P F Graça; M A Valent; O Messaoudi; S Elgharbi; Ahmed Dhahri; L Manai

doi:10.1039/d2ra01006b

Investigation of the structural, electrical, and dielectric properties of La_0.5Sm_0.2Sr_0.3Mn_{1- x} Cr _x O₃ for electrical application

RSC Adv. 2022 Jun 7;12(26):16805-16822. doi: 10.1039/d2ra01006b. eCollection 2022 Jun 1.

Authors

Khouloud Abdouli¹, F Hassini^{2

3}, W Cherif¹, P R Prezas⁴, M P F Graça⁴, M A Valent⁴, O Messaoudi⁵, S Elgharbi⁶, Ahmed Dhahri⁷, L Manai⁵

Affiliations

¹ Sfax University, Faculty of Sciences B. P. 1171 3000 Tunisia.
² Research Unit of Valorization and Optimization of Exploitation of Resources, Faculty of Science and Technology of Sidi Bouzid, Kairouan University 9100 Sidi Bouzid Tunisia.
³ Laboratory of Physical Chemistry of Materials, Physics Department, Faculty of Sciences of Monastir, Monastir University 5019 Monastir Tunisia.
⁴ I3N - University of Aveiro Aveiro Portugal.
⁵ Physics Department, College of Sciences, University of Ha'il Saudi Arabia.
⁶ Department of Chemistry, College of Science, University of Hail Ha'il Kingdom of Saudi Arabia.
⁷ Department of Physics, College of Science and Humanities - Dawadmi, Shaqra University Riyadh Saudi Arabia.

Abstract

In the present research, polycrystalline samples of La_0.5Sm_0.2Sr_0.3Mn_1-x Cr _x O₃ are prepared using the self-combustion method. Then, we have studied their crystalline structure, and dielectric and electrical properties. The X-ray diffraction study shows that all the samples exhibit a single phase with orthorhombic structure (space group Pnma). The studied samples were also characterized by complex impedance spectroscopy in a wide range of temperatures and frequency. AC conductivity analyses are used to study the transport property of the investigated samples. These analyses indicate that the conduction mechanism is strongly dependent on temperature and frequency. It is also found that the conductivity decreases with Cr concentration. Complex impedance analysis confirms the contributions of grain and grain boundaries in the conduction mechanism. Finally, the impedance spectra, characterized by the appearance of semicircle arcs at different temperatures, were well modeled in terms of equivalent electrical circuits to explain the impedance results.