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

Pecharsky, Alexandra O; Pecharsky, Vitalij K

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

Patent · Tue Jul 08 00:00:00 EDT 2003

OSTI ID:1007473

Pecharsky, Alexandra O ^[1]; Pecharsky, Vitalij K ^[1]

Ames, IA

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.

Research Organization:: Iowa State University

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-82

Assignee:: Iowa State University Research Foundation, Inc. (Ames, IA)

Patent Number(s):: 6,589,366

Application Number:: 09/793,822

OSTI ID:: 1007473

Country of Publication:: United States

Language:: English

References (12)

Giant Magnetocaloric Effect in Gd5(Si2Ge2) Pecharsky, V. K.; Gschneidner, Jr., K. A. Physical Review Letters, Vol. 78, Issue 23, p. 4494-4497 https://doi.org/10.1103/PhysRevLett.78.4494	journal	June 1997
Tunable magnetic regenerator alloys with a giant magnetocaloric effect for magnetic refrigeration from ∼20 to ∼290 K Pecharsky, V. K.; Gschneidner, K. A. Applied Physics Letters, Vol. 70, Issue 24 https://doi.org/10.1063/1.119206	journal	June 1997
Giant magnetoresistance near the magnetostructural transition in Gd5(Si1.8Ge2.2) Morellon, L.; Stankiewicz, J.; Garcı́a-Landa, B. Applied Physics Letters, Vol. 73, Issue 23 https://doi.org/10.1063/1.122797	journal	December 1998
Magnetic-field-induced structural phase transition in Gd 5 ( S i 1.8 Ge 2.2 ) Morellon, L.; Algarabel, P. A.; Ibarra, M. R. Physical Review B, Vol. 58, Issue 22 https://doi.org/10.1103/PhysRevB.58.R14721	journal	December 1998
Hall effect in Gd 5 ( Si 1.8 Ge 2.2 ) Stankiewicz, J.; Morellon, L.; Algarabel, P. A. Physical Review B, Vol. 61, Issue 19 https://doi.org/10.1103/PhysRevB.61.12651	journal	May 2000
The solubility of tantalum in eight liquid rare-earth metals Dennison, D. H.; Tschetter, M. J.; Gschneidner, K. A. Journal of the Less Common Metals, Vol. 10, Issue 2 https://doi.org/10.1016/0022-5088(66)90119-6	journal	February 1966
Magnetic-field and temperature dependencies of the electrical resistance near the magnetic and crystallographic first-order phase transition of Gd 5 ( S i 2 Ge 2 ) Levin, E. M.; Pecharsky, V. K.; Gschneidner, K. A. Physical Review B, Vol. 60, Issue 11 https://doi.org/10.1103/PhysRevB.60.7993	journal	September 1999
Effect of alloying on the giant magnetocaloric effect of Gd5(Si2Ge2) Pecharsky, V. K.; Gschneidner, K. A. Journal of Magnetism and Magnetic Materials, Vol. 167, Issue 3 https://doi.org/10.1016/S0304-8853(96)00759-7	journal	March 1997
Giant magnetoresistance in the Ge-rich magnetocaloric compound, Gd5(Si0.1Ge0.9)4 Morellon, L.; Algarabel, P. A.; Magen, C. Journal of Magnetism and Magnetic Materials, Vol. 237, Issue 2 https://doi.org/10.1016/S0304-8853(01)00506-6	journal	December 2001
Chapter 51 Phase equilibria in ternary and higher order systems with rare earth elements and silicon Rogl, Peter Handbook on the Physics and Chemistry of Rare Earths https://doi.org/10.1016/S0168-1273(84)07004-5	book	January 1984
Nature of the first-order antiferromagnetic-ferromagnetic transition in the Ge-rich magnetocaloric compounds Gd 5 ( Si x Ge 1 − x ) 4 Morellon, L.; Blasco, J.; Algarabel, P. A. Physical Review B, Vol. 62, Issue 2 https://doi.org/10.1103/PhysRevB.62.1022	journal	July 2000
Phase relationships and crystallography in the pseudobinary system Gd5Si4Gd5Ge4 Pecharsky, V. K.; Gschneidner, K. A. Journal of Alloys and Compounds, Vol. 260, Issue 1-2 https://doi.org/10.1016/S0925-8388(97)00143-6	journal	September 1997

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