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Method of making active magnetic refrigerant materials based on Gd-Si-Ge alloys

United States Patent

October 3, 2006
View the Complete Patent at the US Patent & Trademark Office
Ames Laboratory - Visit the Iowa State University Research Foundation - Office of Intellectual Property & Technology Transfer Website
Production of Giant magnetocaloric Substances Using Commercially Available Raw Materials
Cost Effective Production of Giant Magneto-Caloric Materials
An alloy made of heat treated material represented by Gd.sub.5(Si.sub.xGe.sub.1-x).sub.4 where 0.47.ltoreq.x.ltoreq.0.56 that exhibits a magnetic entropy change (-.DELTA.S.sub.m) 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.
Pecharsky; Alexandra O. (Ames, IA), Gschneidner, Jr.; Karl A. (Ames, IA), Pecharsky; Vitalij K. (Ames, IA)
Iowa State University Research Foundation, Inc. (Ames, IA)
10/ 413,417
April 14, 2003
CONTRACTUAL ORIGIN OF INVENTION The United States Government has rights in this invention pursuant to Contract No. W-7405-ENG-82 between the U.S. Department of Energy and Iowa State University, Ames, Iowa, which contract grants to the Iowa State University Research Foundation, Inc. the right to apply for this patent.