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Cost Effective Production of Giant Magneto-Caloric Materials
Category(s):
For Information, Contact:
Craig Forney
Commercialization Manager, Chemistry and Materials Sciences
515-294-4740
licensing@iastate.edu
Web Published:
5/15/2015
ISURF #
2487
Summary:
Researchers at Iowa State University and Ames Laboratory have developed a cost effective method for producing giant magnetocaloric material Gd5(SixGe1-x)4, useful for various types of refrigeration applications, from liquifaction of helium (4K) to room temperature air conditioning and climate control.

Development Stage:
Samples of the material have been produced.

Description:
Magnetic refrigeration has promise as an alternative to compressor technology for applications that range from liquefaction of helium to room temperature air conditioning. However, for most magnetic refrigeration applications large amounts (several hundred grams to hundreds of kilograms) of the magnetocaloric materials are needed to obtain sufficient cooling.  Unfortunately, processes for making giant magnetocaloric materials materials has been difficult to scale efficiently and still produce homogenous ingots.  To overcome this limitation, Iowa State University and Ames Laboratory researchers have developed a new method for utilizing commercially available Gadolinium feedstock for cost effective production of material with improved magneto-caloric properties.  As a consequence, this method may enhance the commercial utility of of magnetic refrigeration technologies which are environmentally friendly and highly efficient.

Advantage:
• This new method allows for cost effective production of Gd5(SixGe1-x)4 samples of 1 kilogram or more, which have improved magnetocaloric properties over material produced by other methods. (The magnetocaloric effect is approximately 25% better than the first reported values (Physical Review Letters, June 1997) for the Gd5(Si2Ge2) which was prepared in 10-20g quantities by arc melting using high purity Ames Laboratory Gd metal).
• The lower cost will dramatically improve the commercial viability of magnetic refrigeration technologies which are environmentally friendly and efficient.
• No commercial method is currently available to use commercial Gd metal to produce Gd5(Si2Ge2) in large quantities and with high magnetocaloric effect.
Application:
Applications exist anywhere there is need for freezing, heating, or cooling. Industries which produce cryogenics systems; supermagnets; and HVAC systems for homes, vehicular transports and other applications will be interested in this technology.

References:
Patent Information:
*To see the full version of the patent(s), follow the link below, then click on "Images" button.
Country Serial No. Patent No. Issued Date
United States 10/413,417 7,114,340* 10/3/2006


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