Magnetocaloric properties and unconventional critical behavior in (Gd,Tb)6(Fe,Mn)Bi2 intermetallics

Selecting optimal R6TX2 intermetallics (R = Gd, Tb, Dy; T = Mn, Fe, Co, Ni; X = Sb, Te) for magnetic refrigeration

“…2(b and d)), while a change in the p-block element has only shown to have a minor effect on the position of the Curie temperature. [29][30][31] Three general trends regarding the effect of the c cell parameter on the Curie temperature have been detected in this study. On one hand, the three compounds with a larger c cell parameter, which are the ones with Dy 4 and Sb 2 in their composition (compounds 2, 3, and 4 as labelled in Table 1), show a linear increase of T C following the c cell parameter (see Fig.…”

“…This behavior has already been observed in our previous studies on this family, with a greater effect on compounds containing Tb and Dy. 30,31 T C and T m are precisely indicated by the position of the peaks in the real part of ac susceptibility, as shown in the lower (c) and (d) graphs of Fig. 2.…”

“…This journal is © The Royal Society of Chemistry 2023 case the Mean Field (MF) model yields the best results, but only for Tb 2 Dy 4 FeSb 2 there was an optimal starting point for the iterative procedure. As we already observed for previously studied compounds belonging to the R 6 TX 2 family, [29][30][31] the critical behavior of the remaining compounds cannot be described by any known universality class, which means that we had to map β and γ values searching for good initial values, i.e., where we get straight parallel lines in the MAP. The values thus obtained are then adjusted in an iterative procedure, for which we extract M S and χ 0 −1 by linear extrapolation from the high field data in the MAP.…”

“…The purpose of this work is to explore the most relevant physical properties of some members of the general R 6 TX 2 intermetallic family, in particular, Gd 6 (Fe,Mn)Bi 2 , (Gd,Tb) 6 (Fe,Mn)Bi 2 and Dy 6 (Fe,Mn)X 2 families. [29][30][31] Sb and Te have been selected as the X elements in order to increase the magnetocaloric effect, as was observed in previous studies. 31 The combination of Tb, Gd and Dy is also expected to improve the magnetocaloric properties and to place the critical temperature (T C ) closer to room temperature.…”

Magnetic transitions with magnetocaloric effects near room temperature related to structural transitions in Y0.9Pr0.1Fe2D3.5 deuteride

“…or a certain degree of disorder in the system [67,68]. The latter case is the most probable one in our system, since some disorder is still observed in the monoclinic phase due to D sites occupation.…”