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

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

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 30.degree. C./min or higher, and the melt solidifies to form a single crystal of the material.

Inventors:: Evans, III, Boyd Mccutchen; Kisner, Roger A.; Ludtka, Gail Mackiewicz; Ludtka, Gerard Michael; Melin, Alexander M.; Nicholson, Donald M.; Parish;, Chad M.; Rios, Orlando; Sefat, Athena S.; West, David L.; Wilgen, John B.

Issue Date:: 2016-02-09

OSTI Identifier:: 1241337

Assignee:: UT-Battelle, LLC (Oak Ridge, TN) ORNL

Patent Number(s):: 9,255,343

Application Number:: 13/790,560

Contract Number:: AC05-00OR22725

Resource Relation:: Patent File Date: 2013 Mar 08

Research Org:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org:: USDOE

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

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Other works cited in this record:

Using magnetic field gradients to control the directional solidification of alloys and the growth of single crystals
journal, September 2004

Ganapathysubramanian, Baskar; Zabaras, Nicholas
Journal of Crystal Growth, Vol. 270, Issue 1-2, p. 255-272
DOI: 10.1016/j.jcrysgro.2004.06.020

Magnetocaloric effect in FeCr soft magnetic nanocrystalline alloys
journal, September 2007

Gómez-Polo, C.; Socolovsky, L. M.; Denardin, J. C.
Journal of Magnetism and Magnetic Materials, Vol. 316, Issue 2, p. e876-e878
DOI: 10.1016/j.jmmm.2007.03.127

The use of magnetic fields in semiconductor crystal growth
journal, August 1991

Series, R. W.; Hurle, D. T. J.
Journal of Crystal Growth, Vol. 113, Issue 1-2, p. 305-328
DOI: 10.1016/0022-0248(91)90036-5

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