Hydrothermal synthesis and magnetocaloric effect of La0.7Ca0.2Sr0.1MnO3

✍ Scribed by W.A. Sun; J.Q. Li; W.Q. Ao; J.N. Tang; X.Z. Gong

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 381 KB
• Volume: 166
• Category: Article
• ISSN: 0032-5910
• DOI: 10.1016/j.powtec.2006.05.015

✦ Synopsis

The hydrothermal synthesis and magnetic entropy change for the perovskite manganite La 0.7 Ca 0.2 Sr 0.1 MnO 3 have been studied. The La 0.7 Ca 0.2 Sr 0.1 MnO 3 can be produced as phase-pure, crystalline powder in one step from solutions of metal salts in aqueous potassium hydroxide solution at a temperature of 240 °C in 72 h. Scanning electron microscopy shows that the materials are made up of cuboid-shaped or rod-shaped particles with typical dimension of 4.0 μm. Heat treatment is necessary to improve the magnetocaloric effect for the hydrothermal sample. The maximum magnetic entropy change (|ΔS M |) for the sample annealed at 1200 °C for 6 h is 2.85 J kg -1 K -1 at the magnetic field change of 2.0 T and 2.23 J kg -1 K -1 at the magnetic field change of 1.5 T at 315 K. The hydrothermal synthesis method is a feasible route to prepare high quality perovskite material for magnetic refrigeration application.