التفاصيل البيبلوغرافية
| العنوان: |
Effect of Cr Substitution on Magnetic and Magnetocaloric Properties for La0.62Nd0.05Ba0.33MnO3. |
| المؤلفون: |
Tillaoui, S., Ounacer, M., Essoumhi, A., Razouk, A., Hlil, EK., Sahlaoui, M., Sajieddine, M. |
| المصدر: |
Journal of Superconductivity & Novel Magnetism; Jun2022, Vol. 35 Issue 6, p1657-1667, 11p |
| مصطلحات موضوعية: |
MAGNETIC properties, MAGNETIC cooling, LANDAU theory, MAGNETIC transitions, MAGNETOCALORIC effects, MANGANESE alloys, HEUSLER alloys |
| مستخلص: |
In this paper, we investigate the structural, magnetic, and magnetocaloric properties of La0.62Nd0.05Ba0.33Mn1-xCrxO3 manganites elaborated by sol gel process. X-ray diffraction analyses confirm that all elaborated samples are crystallized on the rhombohedral perovskite structure with R-3c space group. Magnetic measurements reveal the presence of a magnetic transition from paramagnetic (PM) to ferromagnetic (FM) phase in the vicinity of Curie temperature TC. However, as Cr concentration increases, we witness a decrease in TC from 285 K for x = 0 to 250 K for x = 0.20. This behavior can be explained by the double exchange interaction of Mn3+-O-Mn4+. The maximum entropy change (- Δ S m max ) at µ0H = 5 T is found to be 2.63, 1.88, and 1.76 J.kg−1.K−1 for x = 0, 0.10, and 0.20, respectively. However, our research underlines the enhancement of relative cooling power (RCP) by Cr doping, from 310 to 340 J.kg−1 as Cr concentration increases from x = 0 to 0.20. This finding suggests the usefulness of our samples as magnetic refrigeration material around room temperature. Furthermore, the analysis of the magnetocaloric effect (MCE) using the Landau theory shows a good agreement with the experimental results with a soft difference, indicating the importance of Jahn–Teller interactions on manganites perovskite. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |