Effect of Sn-doping on the structural, magnetic and magnetocaloric properties of La0.67Ba0.33Mn1-xSnxO3 compounds

Magnetocaloric effect (MCE) in fine-grained perovskite manganites of the type La0.67Ba0.33Mn1-xSnxO3 (x = 0.05, 0.1 and 0.15) were prepared by the solid-state method. The prepared samples remain single phase and exhibit paramagnetic to ferromagnetic phase transition (T-C) at 340, 325 and 288 K for x 0.05, 0.1 and 0.15, respectively. From the measured magnetization data of La0.67Ba0.33Mn1-xSnxO3 compounds as a function of field (2T), the associated magnetic entropy change close to their respective Curie temperatures and the relative cooling power (RCP) have been determined. Large MCE has been obtained in all samples and vertical bar Delta S-M vertical bar(max) reached the highest value of 2.49 J/kg K at T-C (288 K) for the sample x 0.15, with H = 2T. (C) 2008 Elsevier B.V. All rights reserved.