Active magnetic refrigerants based on Gd-Si-Ge material and refrigeration apparatus and process
- Ames, IA
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.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)
- DOE Contract Number:
- W-7405-ENG-82
- Assignee:
- Iowa State University Research Foundation, Inc. (Ames, IA)
- Patent Number(s):
- US 5743095
- Application Number:
- 08/753,064
- OSTI ID:
- 871493
- Country of Publication:
- United States
- Language:
- English
New ferromagnetic 5 : 4 compounds in the rare earth silicon and germanium systems
|
journal | November 1967 |
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Related Subjects
magnetic
refrigerants
based
gd-si-ge
material
refrigeration
apparatus
process
regenerator
method
gd
1-x
equal
refrigerant
exhibits
reversible
ferromagnetic
antiferromagnetic
ferromagnetic-ii
ferromagnetic-i
phase
transition
extraordinary
magneto-thermal
properties
giant
magnetocaloric
effect
renders
efficient
useful
existing
commercialization
regenerators
tunable
approximately
30
290
near
temperature
compositional
adjustments
function
refrigerating
air
conditioning
liquefying
cryogens
significantly
improved
efficiency
operating
range
10
300
heater
paramagnetic
permits
heat
pump
280
350
composition
level
heating
climate
control
buildings
homes
automobile
chemical
processing
significantly improved
climate control
air conditioning
improved efficiency
active magnetic
temperature range
heat pump
operating temperature
refrigeration apparatus
magnetic regenerator
chemical processing
thermal properties
phase transition
chemical process
magnetic refrigerant
magnetic refrigerants
magnetic heat
magnetocaloric effect
significantly improve
position adjustment
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