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Title: Method of making active magnetic refrigerant, colossal magnetostriction and giant magnetoresistive materials based on Gd-Si-Ge alloys

Abstract

Method of making an active magnetic refrigerant represented by Gd.sub.5 (Si.sub.x Ge.sub.1-x).sub.4 alloy for 0.ltoreq.x.ltoreq.1.0 comprising placing amounts of the commercially pure Gd, Si, and Ge charge components in a crucible, heating the charge contents under subambient pressure to a melting temperature of the alloy for a time sufficient to homogenize the alloy and oxidize carbon with oxygen present in the Gd charge component to reduce carbon, rapidly solidifying the alloy in the crucible, and heat treating the solidified alloy at a temperature below the melting temperature for a time effective to homogenize a microstructure of the solidified material, and then cooling sufficiently fast to prevent the eutectoid decomposition and improve magnetocaloric and/or the magnetostrictive and/or the magnetoresistive properties thereof.

Inventors:
 [1];  [2];  [2]
  1. (Ames, IA)
  2. Ames, IA
Issue Date:
Research Org.:
Iowa State Univ., Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1007473
Patent Number(s):
6589366
Application Number:
09/793,822
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA)
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02B - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Gschneidner, Jr., Karl A., Pecharsky, Alexandra O, and Pecharsky, Vitalij K. Method of making active magnetic refrigerant, colossal magnetostriction and giant magnetoresistive materials based on Gd-Si-Ge alloys. United States: N. p., 2003. Web.
Gschneidner, Jr., Karl A., Pecharsky, Alexandra O, & Pecharsky, Vitalij K. Method of making active magnetic refrigerant, colossal magnetostriction and giant magnetoresistive materials based on Gd-Si-Ge alloys. United States.
Gschneidner, Jr., Karl A., Pecharsky, Alexandra O, and Pecharsky, Vitalij K. Tue . "Method of making active magnetic refrigerant, colossal magnetostriction and giant magnetoresistive materials based on Gd-Si-Ge alloys". United States. https://www.osti.gov/servlets/purl/1007473.
@article{osti_1007473,
title = {Method of making active magnetic refrigerant, colossal magnetostriction and giant magnetoresistive materials based on Gd-Si-Ge alloys},
author = {Gschneidner, Jr., Karl A. and Pecharsky, Alexandra O and Pecharsky, Vitalij K},
abstractNote = {Method of making an active magnetic refrigerant represented by Gd.sub.5 (Si.sub.x Ge.sub.1-x).sub.4 alloy for 0.ltoreq.x.ltoreq.1.0 comprising placing amounts of the commercially pure Gd, Si, and Ge charge components in a crucible, heating the charge contents under subambient pressure to a melting temperature of the alloy for a time sufficient to homogenize the alloy and oxidize carbon with oxygen present in the Gd charge component to reduce carbon, rapidly solidifying the alloy in the crucible, and heat treating the solidified alloy at a temperature below the melting temperature for a time effective to homogenize a microstructure of the solidified material, and then cooling sufficiently fast to prevent the eutectoid decomposition and improve magnetocaloric and/or the magnetostrictive and/or the magnetoresistive properties thereof.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {7}
}

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Works referenced in this record:

Giant magnetoresistance near the magnetostructural transition in Gd5(Si1.8Ge2.2)
journal, December 1998


Giant magnetoresistance in the Ge-rich magnetocaloric compound, Gd5(Si0.1Ge0.9)4
journal, December 2001


Giant Magnetocaloric Effect in Gd5(Si2Ge2)
journal, June 1997


Magnetic-field-induced structural phase transition in Gd 5 ( S i 1.8 Ge 2.2 )
journal, December 1998


Effect of alloying on the giant magnetocaloric effect of Gd5(Si2Ge2)
journal, March 1997


Tunable magnetic regenerator alloys with a giant magnetocaloric effect for magnetic refrigeration from ∼20 to ∼290 K
journal, June 1997


Hall effect in Gd 5 ( Si 1.8 Ge 2.2 )
journal, May 2000


Phase relationships and crystallography in the pseudobinary system Gd5Si4Gd5Ge4
journal, September 1997


The solubility of tantalum in eight liquid rare-earth metals
journal, February 1966