The Giant Magnetocaloric Effect in Gd5(SixGe1-x)4 Materials for Magnetic Refrigeration
The Gd5(SixGe1-x)4 alloys, where 0 ≤ x ≤ 0.5, exhibit a giant magnetocaloric effect. This extremely large magnetocaloric effect should elevate magnetic refrigeration technology to new heights allowing it to become even more competitive with other existing refrigeration technologies. The temperature of the giant magnetocaloric effect is easily tunable between ~30 and ~275 K by changing the Si:Ge ratio. Furthermore, by alloying with Ga, the giant magnetocaloric effect temperature increases to ~290 K. The reversible magnetic field induced magnetic entropy change, ΔSmag, and the adiabatic temperature rise, ΔTad, for a low to moderate magnetic field change (from 0 to 2–10 T) are the largest ever observed at the corresponding Curie temperatures. The ΔSmag is 100 to 400%, and the ΔTad is 25 to 200% larger than that for the best known prototypes.
KeywordsOrder Phase Transition Magnetocaloric Effect Magnetic Entropy Change Magnetic Refrigeration Magnetic Field Change
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