Hydrothermal Synthesis and Magnetocaloric Effect of La0.7Ca0.2Sr0.1MnO3
The hydrothermal synthesis and magnetic entropy change for the perovskite manganite La0.7Ca0.2Sr0.1MnO3 have been studied. The La0.7Ca0.2Sr0.1MnO3 can be produced as phase-pure, crystalline powder in one step from solutions of metal salts in aqueous potassium hydroxide solution at temperature of 240 ℃ 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 for the sample annealed at 1200 ℃ for 6 h is 2.85 J.kg-.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.
Hydrothermal synthersis Magnetic entropy change Manganite.
W. A. Sun J. Q. Li W. Q. Ao J. N. Tang X. Z. Gong
School of Materials, Shenzhen University and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, P. R China
国际会议
厦门
英文
464-468
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）