Magnetocaloric Properties in the Gd$_{5}$(Si$_{2}$Ge$_{2}$)$_{1-{\rm z}}$Fe$_{\rm z}({\rm Z}=0-0.75)$ System and the Magnetic Properties of the Newly Formed Gd$_{5}$(Si,Ge)$_{3}$ Phase

R5T4 Compounds

“…Magnetocaloric properties of the Gd 5 Si 2 Ge 1.9 Ga 0.1 sample, which according to the X-ray powder diffraction analysis contained $81% of the 5:4 major phase, $4% of the 1:1 phase, and $15% of the 5:3 phase, were studied by means of heat capacity and direct magnetocaloric measurements (Palacios et al, 2010a). Podmiljšak et al (2009b) carried out an extensive study of how the Si-for-Fe, Ge-for-Fe, and (Si,Ge)-for-Fe substitutions affect the phase composition and magnetocaloric properties of Gd 5 Si 2 Ge 2 . The substitution of Si by Fe, however, does not suppress the structural transition in Gd 5 Si 2Àx Fe x Ge 2 alloys but instead promotes the formation of the 5:3 phase (Podmiljšak et al, 2008(Podmiljšak et al, , 2009a.…”

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“…Only Ga was found not to suppress Δ|S M | and then only for small substitutions [29]. The potential of Gd 5 Si 2 Ge 1.…”

“…In order to assess the various samples of Gd 5 (Si 2 Ge 2 ) based alloys we combined in Figure 3. The various results of the magnetic entropy change versus temperature were plotted, as we did for Figure 2 [15,29,31]. Out the five samples with Sn doping presented in Table 3.…”

Improvement of magnetocaloric properties of Gd-Ge-Si alloys by alloying with iron

“…These strong effects are dependent on the actual structure of the alloys, which, in turn, depends on the processing route, including melting and heat treatment. Recent works [5][6] suggested that the small addition of iron to the Gd 5 Si x Ge 4-x alloys results in changes in magnetocaloric properties of this type of alloys. This was the starting point to investigate the issue of modification of Gd 5 Si x Ge 4-x alloys with Fe.…”