9 Result(s)
within
V. K. Pecharsky
Industrial Chemistry/Chemical Engineering
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Chapter
New Magnetic Refrigeration Materials for the Liquefaction of Hydrogen
Five heavy lanthanide ferromagnetic intermetallic compounds were studied as potential magnetic refrigerants for the liquefaction of hydrogen gas. (Dy0.5Er0.5)Al2 and TbNi2 appear to be better refrigerants than Gd...
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The (Dy1-xErx)Al2 Alloys as Active Magnetic Regenerators for Magnetic Refrigeration
The low temperature properties (heat capacity from 3 to 350 K in fields up to 10 T, and both ac magnetic susceptibility and dc magnetic susceptibility and magnetization from 4 to 325 K in dc fields up to 5.5 T...
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Comparison of the Magnetocaloric Effect Derived from Heat Capacity, Direct, and Magnetization Measurements
A theoretical and experimental evaluation of the experimental method for determining the magnetocaloric properties of magnetic materials show that the magnetic field heat capacity data can provide a reliable r...
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Chapter
New Er-Based Materials for Active Magnetic Refrigeration Below 20K
High magnetic field (0 to 9.85 T) low temperature (1.2 to 30 K) heat capacity of five as-cast alloys: Er3AlC, Er3AlC0.5, Er3AlC0.25, Er3AlC0.1 and ErAgGa revealed that four of them can be used as efficient active...
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Utilization of the Magnetic Entropy in Active Magnetic Regenerator Materials
The magnetic entropy associated with magnetic ordering has been determined for ~20 lanthanide materials and it varies from ~60 to ~90% of the theoretical Rln (2J+l) value. The utilization of this entropy in th...
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The Influence of Multiple Magnetic Ordering on the Magnetocaloric Effect in RNiAl Alloys
Both the change in magnetic entropy (ΔSmag) and the adiabatic temperature rise (ΔTad) induced by a change of magnetic field were determined for a series of (Gd1-xErx)NiAl alloys (where x = 0, 0.30, 0.46, 0.60, 0....
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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 becom...
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Magnetocaloric Effect in GdAl2 and Nd2Fe17
The magnetocaloric properties of GdAl2 and Nd2Fe17 have been determined by three methods: (1) measured directly in pulsed (∼0.2 s duration) and semi-static magnetic fields; (2) calculated from the heat capacity m...
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Chapter
Magnetothermal Properties of Dy5(SixGe1−x)4 Alloys
A study of a series of Dy5(SixGe1−x)4 alloys using dc and ac magnetic susceptibility, magnetization, heat capacity, and x-ray powder diffraction techniques revealed that the variation of the magnetic properties a...
