Calorimetric study and Kissinger analysis of melt-spun DyMn6−xGe6−xFexAlx (1⩽x⩽2.5) alloys

Activation Energies of Crystallization in Amorphous RMn4.5Ge4.5Fe1.5Al1.5(R = La, Y, Dy) Alloys

“…No signs of glass transition were observed for La-and Y-based amorphous alloys in the DSC scans. This behavior is similar to that reported earlier for DyMn 6−x Ge 6−x Fe x Al x [1,3]. There are different suggested explanations for this absence of a clear signature for the glass transition [1].…”

“…This ascertains the high GFA in this class of multinary alloys also for other rare earths than the previously investigated Dy-based systems [1]. Thermal characteristics (DSC) and crystalline structures of annealed samples of YMn 4.5 Ge 4.5 Fe 1.5 Al 1.5 are similar to the properties of the DyMn 4.5 Ge 4.5 Fe 1.5 Al 1.5 alloy [3]. However, the crystallization process and its products are different for LaMn 4.5 Ge 4.5 Fe 1.5 Al 1.5 , which indicates the importance of the R-radius in this alloys system.…”

“…These values exceed the activation energy determined earlier for DyMn 4.5 Ge 4.5 Fe 1.5 Al 1.5 [3] which reaches only 455 ± 40 kJ/mol. These rather large changes in E a could be due to the different atomic radii of these rare earths with Dy having the smallest atomic radius r = 0.1774 nm, while Y has a radius r = 0.18015 nm.…”

“…Some compositions of this series with Dy have already been obtained in fully amorphous state, and it was shown that they display interesting and complex magnetic properties [1][2][3]. Also for R = La and Y amorphization is attainable in the same range of compositions.…”

Magnetism influenced by structural disorder in melt-spun DyMn6 − x Ge6 − x Fe x Al x (x = 2.5, 3)

“…From the Gauss curve fitting the smallest interatomic distances and sizes of coherently scattered domains were determined [2] as 0.28 and 0.83 nm, respectively. DyMn 3.5 Ge 3.5 Fe 2.5 Al 2.5 in the first step of crystallisation forms a multiphase alloy with dominant contributions of two phases.…”