SUPERCONDUCTIVITY IN METALS AND ALLOYS

Technical Report · Mon Jan 01 00:00:00 EST 1962

OSTI ID:4773022

Cherry, W H; Cody, G D; Cooper, J L; Gittleman, J I; Hanak, J J; McConville, G T; Rayl, M; Rosi, F D

Methods were developed for the measurement of the interphase energy in superconductors. A description of the method is given along with preliminary results on thin foils and films of Sn. Measurements were made of the thermal contact resistance (Kaptiza resistance) between various solids and liquid He. These measurements were made in the normal and superconducting states for Pb, Sn, and In, and for the insulator sapphire. Measurements were made of the transition temperatures in the system (Nb, Ta, V)/sub 3/Sn. The transition temperatures range from 2.8 to 18 deg K and can be related to a simple mass and volume dependence. A new method of preparation of Nb/sub 3/Sn was developed and is described in detail. With this method it is possible to prepare crystalline Nb/ sub 3/Sn and to deposit films of Nb/sub 3/SN in various geometries. The application of this technique to the continuous deposition of Nb/sub 3/Sn on wire is described, and some superconducting properties of this wire are given. Alloying experiments were raade and results indicate ambiguities in the electron- to-atom ratio ascribed to various elements. Resistance measurements on sintered and nonsintered specimens of Nb/sub 3/Sn reveal a resistance anomaly near 100 deg K. (auth)

• Research Organization: Radio Corp. of America. RCA Labs., Princeton, N.J.
• DOE Contract Number: AF33(616)-6405
• NSA Number: NSA-17-000406
• OSTI ID: 4773022
• Report Number(s): ASD-TDR-62-269
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: United States
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
ALUMINUM OXIDES
ENERGY
FILMS
FOILS
HELIUM
INDIUM
INTERMETALLIC COMPOUNDS
LEAD
LIQUIDS
MEASURED VALUES
NIOBIUM ALLOYS
PREPARATION
SINTERED MATERIALS
SOLIDS
SUPERCONDUCTIVITY
TANTALUM ALLOYS
TEMPERATURE
THERMAL CONDUCTIVITY
THERMAL INSULATION
TIN
TIN ALLOYS
VANADIUM ALLOYS