Method of making active magnetic refrigerant materials based...

Details Method of making active magnetic refrigerant materials based... Method of making active magnetic refrigerant materials based...

2006-10-03

2006-10-03

Sheehan, John Patrick (Department: 1742)

Refrigeration

Using electrical or magnetic effect

C062S006000, C062S004000, C062S051100, C505S889000, C505S890000, C505S891000, C148S301000, C148S101000, C420S416000

Reexamination Certificate

active

07114340

ABSTRACT:
An alloy made of heat treated material represented by Gd5(SixGe1−x)4where 0.47≦x≦0.56 that exhibits a magnetic entropy change (−ΔSm) of at least 16 J/kg K, a magnetostriction of at least 2000 parts per million, and a magnetoresistance of at least 5 percent at a temperature of about 300K and below, and method of heat treating the material between 800 to 1600 degrees C. for a time to this end.

REFERENCES:
patent: 5332029 (1994-07-01), Tokai et al.
patent: 5743095 (1998-04-01), Gschneidner et al.
patent: 6022486 (2000-02-01), Tokai et al.
patent: 6030468 (2000-02-01), Yagi et al.
patent: 6336978 (2002-01-01), Tokai et al.
Hansen, Constitution of Binary Alloys, 1958, pp. 772, 774, 1193 and 1205.
L. Morellon, P.A. Algarabel, M.R. Ibarra, J. Blasco, and B. Garcia-Landa, “Magnetic-field-induced structural phase transition in Gd5(Si1.8Ge2.2)”, Phys. Rev. B58, 721-724 (1998).
L. Morellon, J. Stankiewicz, B. Garcia-Landa, P.A. Algarabel, and M.R. Ibarra, “Giant magnetoresistance near the magnetostructural transition in Gd5(Si1.8Ge2.2)”, Appl. Phys. Lett. 73, 3462-3464 (1998).
L. Morellon, J. Blasco, P.A. Algarabel, and M.R. Ibarra, “Nature of the first-order antiferromagnetic-ferromagnetic transition in the Ge-rich magnetocaloric compounds Gd5(SixGe1-x)4”, Phys. Rev. B62, 1022-1026 (2000).
J. Stankiewicz, L. Morellon, P.A. Algarabel, and M.R. Ibarra, “Hall effect in Gd5(Si1.8Ge2.2)”, Phys. Rev. B61, 12651-12653 (2000).
L. Morellon, P.A. Algarabel, C. Magen, and M.R. Ibarra, “Giant magnetoresistance in the Ge-rich magnetocaloric compound, Gd5(Si0.1Ge0.9)4”, J. Magn. Magn. Mater. 237, 119-123 (2001).
E.M. Levin, V.K. Pecharsky, and K.A. Gschneidner, Jr., “Magnetic field and temperature dependencies of the electrical resistance near the magnetic crystallographic first order phase transition of Gd5(Si2Ge2)”, Phys. Rev. B60, 7993-7997 (1999).
V.K. Pecharsky and K.A. Gschneidner, Jr., “Phase relationships and Crystallography in the Pseudobinary System Gd5Si4-Gd5Ge4”, J. Alloys Compds. 260, 98-106 (1997).
V.K. Pecharsky and K.A. Gschneidner, Jr., “Tunable Magnetic Regenerator Alloys with a Giant Magnetocaloric Effect for Magnetic Refrigeration from ˜20 to˜290K”, Appl. Phys. Lett. 70, 3299-3301 (1997).
V.K. Pecharsky and K.A. Gschneidner, Jr., “Giant Magnetocaloric Effect in Gd5(Si2Ge2)”, Phys. Rev. Lett. 78, 4494-4497 (1997).
V.K. Pecharsky and K.A. Gschneider, Jr., “Effect of Alloying on the Giant Magnetocaloric Effect of Gd5(Si2Ge2)”, J. Magn. Magn. Mater. 167, L179-L184 (1997).
T.B. Massalski, Editor-in-Chief, Binary Alloy Phase Diagrams, 2nded., ASM International, Materials Park, Ohio (1990).
D.H. Dennison, M.J. Tschetter and K.A. Gschneidner, Jr., “The Solubility of Tantalum in Eight Liquid Rare-Earth Metals” J. Less-Common Metals 10, 109-115 (1965).
P. Rogl, “Phase Equilibria in Ternary and Higher Order Systems with Rare Earth Elements and Silicon” in Handbook on the Physics and Chemistry of Rare Earths, K.A. Gschneidner, Jr. and L. Eyring, eds., Elsevier Science Publishers, B.V., Amsterdam, pp. 92-94 (1984).
“Transformations in the Gd5(Si1.95Ge2.05) alloy induced by the temperature and magnetic field cycling though the first-order magnetic-mantensitic phase transition”, E.M. Levin et al., Physical.
Review B, vol. 63, 064426-1 through 10, Jan. 23, 2001.
“Magnetic refrigeration materials”, K.A. Gschneidner, Jr. et al., Journal of Applied Physics, vol. 85, No. 8, pp. 5365-5368, Apr. 15, 1999.
“Uncovering the structure-property relationships is R5(SixGe4-x) intermetallic phases” Vitalij K. Pecharscy et al., Journal of Alloys and Compounds, vol. 344, pp. 362-368, 2002.
“The effect of varying the crystal structure on the magnetism, electronic structure and thermodynamics in the Gd5(SiyGey-x)4system near x=0.5”, V.K. Pecharsky et al., Journal of Solid State Chemistry, vol. 171, pp. 57-68, 2003.
“The room temperature metastable/stabe phase relationships in the pseudo-binar, Gd5Si4—GdgGeySystem” A.O Pecharsky et al., Journal of Alloys and Compounds, vol. 338, pp. 126-135 2002.

Affiliated with

Also associated with

Rating

Method of making active magnetic refrigerant materials based... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of making active magnetic refrigerant materials based..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making active magnetic refrigerant materials based... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3684417