Actions for High specific heat metals for use in superconducting composites. [Cu-(2.4 to 11 percent) Gd2O3].

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High specific heat metals for use in superconducting composites. [Cu-(2.4 to 11 percent) Gd2O3].

Author
Rosenblum, S. S.
Published
United States : [publisher not identified], 1976.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1976.
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Sheinberg, H. and Steyert, W. A.

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Summary
In an effort to enhance adiabatic stability, copper containing percentage amounts of Gd/sub 2/O/sub 3/ powder was prepared. The specific heat (C/sub v/) of the resulting material was measured at temperatures from 2 to 12/sup 0/K in zero and 2.4 T applied magnetic field. Below 5/sup 0/K the C/sub v/ is one to two orders of magnitude higher than that of ordinary copper. For example, at 3.7/sup 0/K in zero field the C/sub v/ of 2.4 percent GdAlO/sub 3/ is 1.5 mJ/g-K and for 7.2 percent Gd/sub 2/O/sub 3/ C/sub v/ is 3.7 mJ/g-K. These results are only weakly dependent on the magnetic field. Resistance ratios (room temperature to 4/sup 0/K) of 99 to 46 are obtained, depending on the method of preparation. Mechanical properties of the copper seem good; photomicrographs of the material are shown. Additional cost for materials is 1.20 per pound for 3 percent oxide in copper. In superconducting applications, a fault which reduces the magnetic field on the copper will actually lower the temperature through adiabatic demagnetization unless there is an appreciable heat input. At 4/sup 0/K, for example, a 3 percent oxide material could absorb the heat required to raise pure copper to 11/sup 0/K, with no change in temperature. It is hoped that this ''doped'' copper will provide more adiabatic stability for composite superconductor-copper wires than pure copper alone.
Report Numbers
LA-UR-76-1790; CONF-760829-21
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
DOE contract number: W-7405-ENG-36
OSTI Identifier 7142707
Research organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States).
View MARC record | catkey: 46147057