Resumo

MARTINEZ SANCHEZ, Hugo; ROJAS MARTINEZ, Yebrayl; OYOLA LOZANO, Dagoberto  e  BUSTOS RODRIGUEZ, Humberto. STUDY OF THE STRUCTURAL AND MAGNETIC PROPERTIES OF GD_0.257-XND_XFE_0.743 AS OBTAINED BY MECHANICAL ALLOYING. Rev.EIA.Esc.Ing.Antioq [online]. 2017, n.27, pp.13-19. ISSN 1794-1237.

This paper presents the study of structural and magnetic properties in the composition Gd_0.257-xNd_xFe_0.743 where x = 0, 0.1285, 0.257 prepared by mechanical alloying in an argon atmosphere and with a milling time of 72 hours using a high energy planetary mill. The magnetic and structural characterization was performed by Mössbauer Spectroscopy (MS) and X-Ray diffraction (XRD), respectively. The three patterns show an intense peak corresponding to the α-Fe phase. Its intensity decreases as Gd is replaced by Nd showing the minimum intensity for x = 0.257, and at the same time it shows a progressive increase in the peak's width. These effects are attributed to the rich presence of Gd and/or Nd atoms in the iron sites. Mössbauer spectra were adjusted with hyperfine field distributions, sextets and singlets using the Mosfit program. The spectra show that by substituting the Gd with Nd atoms, the magnetic order is affected in such a way that iron sites appear and show magnetic disorder.

Palavras-chave : Mechanical Alloying; Mössbauer Spectroscopy; Rare Earth Alloys and Transition Metals; X-Ray Diffraction; Structural and Magnetic Properties.

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