Enhanced relative cooling power of lanthanum-deficiency manganites La0.77−xMg0.23MnO3 (0 ≤ x ≤ 0.2): structural, magnetic and magnetocaloric properties

• Published in: Journal of materials science. Materials in electronics Vol. 33; no. 3; pp. 1703 - 1723
• Main Authors: Selmi, R., Cherif, W., Sarabando, A. R., Ferreira, N. M., Ktari, L.
• Format: Journal Article
• Language: English
• Published: New York Springer US 2022; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Cooling; Ferromagnetic phases; Ferromagnetism; Lanthanum; Magnetic properties; Magnetism; Materials Science; Optical and Electronic Materials; Phase transitions; Transition temperature
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-022-07726-8

Polycrystalline compounds La 0.77− x Mg 0.23 MnO 3 (0 ≤  x  ≤ 0.2) were elaborated using the ceramic method. All the samples are indexed in the orthorhombic structure (Pnma space group). Zero-field-cooled (ZFC) and field-cooled (FC) magnetization measurements show that the samples undergo a paramagnetic-ferromagnetic phase transition and the transition temperature is found to increase from 140.82 K for x  = 0.00 to 191.50 K, for x  = 0.20. The compounds reveal a second-ordered magnetic phase transition around T C . Isothermal entropy change | - Δ S M | was estimated using the Maxwell relation method. The relative cooling power also increases from 158.12 (J/Kg) for x  = 0.00 to 175.94 (J/Kg) for x  = 0.20, under a magnetic field of 5 T. The results suggest that materials could be useful for magnetic refrigeration.