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|Title:||Structure and magnetic properties of melt-spun Nd33(FexAl)67 alloys|
|Authors:||Si, L. |
|Keywords:||Magnetic entropy change|
|Source:||Si, L.,Ding, J.,Li, Y.,Wang, X.Z. (2001). Structure and magnetic properties of melt-spun Nd33(FexAl)67 alloys. Materials Science Forum 360-362 : 553-558. ScholarBank@NUS Repository.|
|Abstract:||Structural and magnetic properties of melt-spun and annealed ribbons with the compositions Nd33(FexAl)67 (x=1,2,3 and 4) have been studied. XRD and DSC results show that an amorphous structure was formed during melt spinning with a wheel surface speed of 30m/s. Several crystalline Nd-Fe-Al phases were found after annealing. A tetragonal phase with a = 9.778 Å and c = 11.516 Å was formed in the Nd33(FexAl)67 (x=2,3 and 4) alloys after melt-spinning and annealing at 873K. This phase is antiferromagnetic with a Néel temperature of 260 K. Metamagnetism is observed at a temperature of 140K or below. Annealing Nd33(FeAl)67 alloy show the formation of a hexagonal phase with lattice parameters a=5.5111Å and c=8.7448Å. The magnetic measurement show that the annealed sample exhibited a hard magnetic behavior at low temperatures with a Curie temperature of 110K and a Neel temperature of 260K and a coercivity of 529 kA/m at 4.2K. The magnetic entropy change was calculated from directly isothermal magnetic measurements. The results showed that the amorphous alloy had a relatively higher magnetocaloric effect than the annealed sample, indicating that it can be considered as a candidate for magnetic refrigeration applications.|
|Source Title:||Materials Science Forum|
|Appears in Collections:||Staff Publications|
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