Magnetocaloric effect of polycrystalline La0.5Sm0.2Sr0.3Mn1-xCrxO3 (0 ≤ x ≤ 0.20) compound prepared by glycine-nitrate process

• Published in: Journal of materials science. Materials in electronics 2021-09, Vol.32 (17), p.22106-22118
• Main Authors: Abdouli, Khouloud, Cherif, W., Valent, M. A., Graça, M. P. F., Ktari, L., Messaoudi, O., Elgharbi, S., Elsofany, W. I.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Chromium; Crystal structure; Curie temperature; Ferromagnetism; Glycine; Magnetism; Manganese; Materials Science; Optical and Electronic Materials; Perovskite structure; Perovskites; Phase transitions; Substitutes
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-06680-1

This paper reports the effect of chromium’s substitution in magnetic oxides with perovskite structure La 0.5 Sm 0.2 Sr 0.3 Mn 1- x Cr x O 3 ( x  = 0, 0.1, 0.15 and 0.2) compounds which have been produced with the glycine-nitrate process (GNP). The four compounds have an orthorhombic crystal structure with ‘ Pnma ’ space group. We note that they undergo a second-order paramagnetic-ferromagnetic (PM-FM) phase transition. Substitution manganese by chromium leads to a drop of the Curie temperature T C from 278 K ( x  = 0) to 205 K ( x  = 0.2). Their magnetocaloric effect has been evaluated by their magnetic entropy change - Δ S M max under a magnetic field change up to 5 T. All relative cooling power (RCP) suggests that these compounds are suitable candidates for magnetic refrigeration.