do Couto, Giselle Giovanna [UNESP]Svitlyk, VolodymyrJafelicci, Miguel [UNESP]Mozharivskyj, Yurij2014-05-202014-05-202011-01-01Solid State Sciences. Amsterdam: Elsevier B.V., v. 13, n. 1, p. 209-215, 2011.1293-2558http://hdl.handle.net/11449/41905High-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.209-215engMagnetic propertiesMagnetocaloric propertiesBall millingStructural transitionArtigo10.1016/j.solidstatesciences.2010.11.016WOS:000287286000035Acesso restrito