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Iron-based composition for magnetocaloric effect (MCE) applications and method of making a single crystal

United States Patent

February 9, 2016
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method of making a single crystal comprises heating a material comprising magnetic anisotropy to a temperature T sufficient to form a melt of the material. A magnetic field of at least about 1 Tesla is applied to the melt at the temperature T, where a magnetic free energy difference .DELTA.G.sub.m between different crystallographic axes is greater than a thermal energy kT. While applying the magnetic field, the melt is cooled at a rate of about C./min or higher, and the melt solidifies to form a single crystal of the material.
Evans, III; Boyd Mccutchen (Oak Ridge, TN), Kisner; Roger A. (Knoxville, TN), Ludtka; Gail Mackiewicz (Oak Ridge, TN), Ludtka; Gerard Michael (Oak Ridge, TN), Melin; Alexander M. (Knoxville, TN), Nicholson; Donald M. (Oak Ridge, TN), Parish; Chad M. (Knoxville, TN), Rios; Orlando (Knoxville, TN), Sefat; Athena S. (Oak Ridge, TN), West; David L. (Oak Ridge, TN), Wilgen; John B. (Oak Ridge, TN)
UT-Battelle, LLC (Oak Ridge, TN)
13/ 790,560
March 8, 2013
FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under Contract No. DE-AC05-00OR22725 awarded by the U.S. Department of Energy. The government has certain rights in the invention.