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Development of New Cryocooler Regenerator Materials--Ductile Intermetallic Compounds.

DE2004832896

Publication Date	2004
Personal Author	Gschneidner, K. A.; Pecharsky, A. O.; Pecharsky, V. K.
Page Count	14
Abstract	The volumetric heat capacities of a number of binary and ternary Er- and Tm-based intermetallic compounds, which exhibited substantial ductilities, were measured from (approx)3 to (approx)350 K. They have the RM stoichiometry (where R = Er or Tm, and M is a main group or transition metal) and crystallize in the CsCl-type structure. The heat capacities of the Tm-based compounds are in general larger than the corresponding Er-based materials. Many of them have heat capacities which are significantly larger than those of the low temperature (<15 K) prototype cryocooler regenerator materials HoCu(sub 2), Er(sub 3)Ni and ErNi. Utilization of the new materials as regenerators in the various cryocoolers should improve the performance of these refrigeration units for cooling below 15 K.
Keywords	Intermetallic compounds Ductility Specific heat Heat capacity Regenerators Performance Cryogenics Cryocoolers
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Iowa State Univ., Ames. Dept. of Materials Science and Engineering.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200516

Development of New Cryocooler Regenerator Materials--Ductile Intermetallic Compounds.

Development of New Cryocooler Regenerator Materials--Ductile Intermetallic Compounds.
DE2004832896

Publication Date	2004
Personal Author	Gschneidner, K. A.; Pecharsky, A. O.; Pecharsky, V. K.
Page Count	14
Abstract	The volumetric heat capacities of a number of binary and ternary Er- and Tm-based intermetallic compounds, which exhibited substantial ductilities, were measured from (approx)3 to (approx)350 K. They have the RM stoichiometry (where R = Er or Tm, and M is a main group or transition metal) and crystallize in the CsCl-type structure. The heat capacities of the Tm-based compounds are in general larger than the corresponding Er-based materials. Many of them have heat capacities which are significantly larger than those of the low temperature (<15 K) prototype cryocooler regenerator materials HoCu(sub 2), Er(sub 3)Ni and ErNi. Utilization of the new materials as regenerators in the various cryocoolers should improve the performance of these refrigeration units for cooling below 15 K.
Keywords	Intermetallic compounds Ductility Specific heat Heat capacity Regenerators Performance Cryogenics Cryocoolers
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Iowa State Univ., Ames. Dept. of Materials Science and Engineering.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200516