Hydrothermal synthesis and Magnetocaloric effect of La0.5Ca0.3Sr0.2MnO3

• Published in: Journal of magnetism and magnetic materials Vol. 302; no. 2; pp. 463 - 466
• Main Authors: LI, J. Q, SUN, W. A, AO, W. Q, TANG, J. N
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Science 01-07-2006
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetocaloric effect, magnetic cooling; Magnetotransport phenomena, materials for magnetotransport; Manganites; Physics; Scanning electron microscopy; Magnetic entropy change; Annealing; Manganite; Curie point; Magnetic field effects; Perovskites; Magnetic refrigerators; Strontium Manganites; Hydrothermal synthesis; Magnetocaloric effects; Aqueous solutions; Calcium Manganites; Manganites; Lanthanum Manganites
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2005.10.007

The hydrothermal synthesis and magnetic entropy change for the perovskite manganite La0.5Ca0.3Sr0.2MnO3 have been studied. The La0.5Ca0.3Sr0.2MnO3 can be produced as phase-pure, crystalline powders in one step from solutions of metal salts in aqueous potassium hydroxide solution at a temperature of 513 K in 72 h. Scanning electron microscopy shows that the materials are made up of cuboidshaped particles in typical dimension of 4.0 x 2.5 x 1.6 mm. Heat treatment can improve the magnetocaloric effect for the hydrothermal sample. The maximum magnetic entropy change ASM for the as-prepared sample is 0.88 J kg-1 K-1 at 315 K for a magnetic field change of 2.0 T. It increases to 1.52 J kg-1 K-1, near its Curie temperature (317 K) by annealing the sample at 1473 K for 6 h. The hydrothermal synthesis method is a feasible route to prepare high-quality perovskite material for magnetic refrigeration application.