Bulk and high-energy ball-milled Gd5Si2Ge2: Comparative study of magnetic and magnetocaloric properties

Artigo

Fecha

2011-01-01

Registro en:

Solid State Sciences. Amsterdam: Elsevier B.V., v. 13, n. 1, p. 209-215, 2011.

1293-2558

http://hdl.handle.net/11449/41905

10.1016/j.solidstatesciences.2010.11.016

WOS:000287286000035

http://repositorioslatinoamericanos.uchile.cl/handle/2250/3912788

Autor

McMaster Univ

Universidade Estadual Paulista (Unesp)

Institución

Universidade Paulista Júlio de Mesquita Filho (Brasil)

Resumen

High-energy ball milling was employed to produce small particles of Gd5Si2Ge2. Magnetic and magnetocaloric properties of the ball-milled and bulk Gd5Si2Ge2 samples were investigated through the magnetization measurements. When compared to the bulk material, a significant decrease in saturation magnetization and magnetocaloric effect (-Delta S-max = 4 vs. 20 J/kgK for Delta H = 0-5 T) is observed even after the relatively short ball milling time of 4 h which produced particles with an average size of ca. 0.5 mu m. The ball-milled samples appear to loose a first-order structural transition, present in bulk Gd5Si2Ge2, and display a superparamagnetic behaviour below the corresponding Curie temperatures. (C) 2010 Elsevier Masson SAS. All rights reserved.

Materias

Magnetic properties

Magnetocaloric properties

Ball milling

Structural transition

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