Active magnetic refrigerants based on Gd-Si-Ge material and refr

Details Active magnetic refrigerants based on Gd-Si-Ge material and refr Active magnetic refrigerants based on Gd-Si-Ge material and refr

1996-11-19

1998-04-28

Kilner, Christopher

Refrigeration

Using electrical or magnetic effect

62 6, 505889, 505891, 148301, F25B 2100

Patent

active

057430950

ABSTRACT:
Active magnetic regenerator and method using Gd.sub.5 (Si.sub.x Ge.sub.1-x).sub.4, where x is equal to or less than 0.5, as a magnetic refrigerant that exhibits a reversible ferromagnetic/antiferromagnetic or ferromagnetic-II/ferromagnetic-I first order phase transition and extraordinary magneto-thermal properties, such as a giant magnetocaloric effect, that renders the refrigerant more efficient and useful than existing magnetic refrigerants for commercialization of magnetic regenerators. The reversible first order phase transition is tunable from approximately 30 K to approximately 290 K (near room temperature) and above by compositional adjustments. The active magnetic regenerator and method can function for refrigerating, air conditioning, and liquefying low temperature cryogens with significantly improved efficiency and operating temperature range from approximately 10 K to 300 K and above. Also an active magnetic regenerator and method using Gd.sub.5 (Si.sub.x Ge.sub.1-x).sub.4, where x is equal to or greater than 0.5, as a magnetic heater/refrigerant that exhibits a reversible ferromagnetic/paramagnetic second order phase transition with large magneto-thermal properties, such as a large magnetocaloric effect that permits the commercialization of a magnetic heat pump and/or refrigerant. This second order phase transition is tunable from approximately 280 K (near room temperature) to approximately 350 K by composition adjustments. The active magnetic regenerator and method can function for low level heating for climate control for buildings, homes and automobile, and chemical processing.

REFERENCES:
patent: 4332135 (1982-06-01), Barclay et al.
patent: 4408463 (1983-10-01), Barclay
patent: 4459811 (1984-07-01), Barclay et al.
patent: 4829770 (1989-05-01), Hashimoto
patent: 5213630 (1993-05-01), Hashimoto
patent: 5435137 (1995-07-01), Gschneidner et al.
patent: 5462610 (1995-10-01), Gschneidner et al.
"Physical Properties of Gd.sub.5 Si.sub.4 ", Sov. Phys. Solid State 22(7), Jul., 1980, pp. 1251-1252, Yu V. Serdyuk et al.
"New Ferromagnetic 5:4 Compounds in the Rare Earth Silicon and Germanium Systems", J. Phys. Chem. Solids, vol. 28, 1967, pp. 2283-2289, F. Holtzberg et al.

Affiliated with

Also associated with

Rating

Active magnetic refrigerants based on Gd-Si-Ge material and refr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active magnetic refrigerants based on Gd-Si-Ge material and refr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active magnetic refrigerants based on Gd-Si-Ge material and refr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1523343