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CHANGES IN THE MICROSTRUCTURE OF Fe-DOPED Gd5Si2Ge2

Skulj, Irena ; McGuiness, Paul ; Podmiljsak, Benjamin

Materiali in tehnologije, 2008-05, Vol.42 (3), p.117-120 [Periódico revisado por pares]

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Título:
CHANGES IN THE MICROSTRUCTURE OF Fe-DOPED Gd5Si2Ge2
Autor: Skulj, Irena ; McGuiness, Paul ; Podmiljsak, Benjamin
É parte de: Materiali in tehnologije, 2008-05, Vol.42 (3), p.117-120
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição: Gd5Si2Ge2-based alloys can exhibit a giant magnetocaloric effect (MCE); this gives them the potential for use in cooling and refrigeration technologies. Cast alloys of this type have been reported to exhibit a three-phase microstructure: the main phase has a composition close to Gd5(Si1.95Ge2335); the secondary phases are Gdi(Si,Ge)1 and Gd5(Si,Ge)3, with the latter reported to have linear features in the microstructure, characteristic of a Widmanstatten pattern. In this investigation we have looked at the effect on the microstructure of Gd5Si2Ge2 resulting from a substitution of Si by Fe, according to the formula Gcl3Si2,FeGe2, where x was varied between 0 and 1. Alloys with six different compositions were prepared using the arc-melting technique. All the samples and their microstructures were observed examined in optical microscope (OM) and a field-emission-gun scanning electron microscope (FEG SEM). The microstructures were quantitatively assessed with energy-dispersive X-ray spectroscopy (EDS) and the samples were characterised using X-ray diffraction (XRD).
Idioma: Esloveno

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