Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2009-10-26
2011-11-01
King, Roy (Department: 1733)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C420S578000, C062S003100
Reexamination Certificate
active
08048236
ABSTRACT:
A Gd5Ge2Si2refrigerant compound is doped or alloyed with an effective amount of silicide-forming metal element such that the magnetic hysteresis losses in the doped Gd5Ge2Si2compound are substantially reduced in comparison to the hysteresis losses of the undoped Gd5Ge2Si2compound. The hysteresis losses can be nearly eliminated by doping the Gd5Ge2Si2compound with iron, cobalt, manganese, copper, or gallium. The effective refrigeration capacities of the doped Gd5Ge2Si2compound are significantly higher than for the undoped Gd5Ge2Si2compound.
REFERENCES:
patent: 7114340 (2006-10-01), Pecharsky et al.
patent: 7651574 (2010-01-01), Shull et al.
Pecharsky et al (NPL: Effect of alloying on the giant magnetocaloric effect of Gd5(Si2Ge2), J. Magn. Magn. Mater. 167 (1997) L179-184, Thereafter, NPL-1).
Zhuang et al (NPL: Giant magnetocaloric effect enhanced by Pb-doping in Gd5Si2Ge2 compound, Journal of alloy and compounds 421 (2006) pp. 49-53, thereafter NPL-2).
Pecharsky, V. K. et al., “Effect of alloying on the giant magnetocaloric effect of Gd5(Si2Ge2),”Journal of Magnetism and Magnetic Materials(1997) 167:L179-L184.
Provenzano, V. A., et al., “Reduction of Hysteresis Losses in the Magnetic Refrigerant Gd5Ge2Si2by the Addition of Iron,”Nature(2004) 429:853-857, Jun. 24.
Zhuang, Y. H. et al., “Giant magnetocaloric effect enhanced by Pb-doping in Gd5Si2Ge2 compound,”Journal of Alloys and Compounds(2006) 421:49-53.
Provenzano Virgil
Shapiro Alexander J.
Shull Robert D.
King Roy
Lambrinos Matthew F.
Lopez Kermit D.
Ortiz Luis M.
The United States of America as represented by the Secretary of
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