Magnetocaloric effect and refrigerant capacity in melt-spun GdaMn alloys

The magnetocaloric properties and microstructure of melt-spun Gd100-xMnx (x=0, 5, 10, 15, and 20 at%) alloys were investigated to explore their potential application as room-temperature magnetic refrigerants. The alloys were composed of nanostructured hexagonal I--Gd phase with grain sizes between 4...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2013-11, Vol.345, p.153-158
Main Authors: Jayaraman, Tanjore, Boone, Laura, Shield, Jeffrey
Format: Article
Language:English
Subjects:
Alloys
Curie temperature
Entropy
Magnetic fields
Magnetic properties
Melt spinning
Nanostructure
Refrigerants
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Summary:The magnetocaloric properties and microstructure of melt-spun Gd100-xMnx (x=0, 5, 10, 15, and 20 at%) alloys were investigated to explore their potential application as room-temperature magnetic refrigerants. The alloys were composed of nanostructured hexagonal I--Gd phase with grain sizes between 40 and 150 nm. Increasing the Mn content resulted in a decrease in the lattice parameters (a and c) of Gd, suggesting the formation of a substitutional solid solution. The Curie temperature (TC), derived from MaT curves and Arrot plots, decreased monotonically from a14293 K (melt-spun Gd) to a14278 K (melt-spun Gd80Mn20). The saturation magnetization at 260 K decreased from a14108 emu/g (melt-spun Gd) to a1478 emu/g (melt-spun Gd80Mn20). The peak value of magnetic entropy change, (aISM)max, decreased from a148.6 J/kgK for melt-spun Gd to a145.9 J/kgK for melt-spun Gd80Mn20 alloy and the refrigeration capacity (RC) initially increased from a14433 J/kg for melt-spun Gd to a14452 J/kg for melt-spun Gd95Mn5 and then gradually decreased to a14321 J/kg for melt-spun Gd80Mn20, for a magnetic field varying from 0 to 5 T. The near-room temperature magnetocaloric properties of melt-spun Gd100-xMnx (0aOxaO20) alloys were found to be comparable to other magnetic refrigerants based on first-order phase transitions.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2013.06.016