Study of liquid-infiltrated Nb-Sn superconducting composite wire by specific-heat measurements

Journal Article · Mon Dec 01 04:00:00 EST 1986 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.337520· OSTI ID:5113664

Hellman, F; Hong, M; Hull, Jr, G W; Geballe, T H

The results of specific-heat and inductive T/sub c/ measurements on reacted liquid-infiltrated superconducting composite wires with an overall composition of Nb-8 at. % Sn are presented. It is found that approximately 23 wt. % of the reacted wire is high T/sub c/ A15 phase, a result not expected from the accepted equilibrium phase diagram. The relatively sharp superconducting transition at 18 K is indicative of a uniform stoichiometric Nb-25 at. % Sn composition in the A15 phase. The large fraction of high T/sub c/ material in these wires is due to taking advantage of the rapid diffusion of Nb in liquid Sn. From a detailed analysis of the specific heat, comments on the reaction process are made. Implications for the equilibrium phase diagram are discussed.

• Research Organization: Department of Applied Physics, Stanford University, Stanford, California 94305
• OSTI ID: 5113664
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 60:11; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
COMPOSITE MATERIALS
DIAGRAMS
FABRICATION
MATERIALS
NIOBIUM ALLOYS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
SPECIFIC HEAT
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTING WIRES
THERMODYNAMIC PROPERTIES
TIN ALLOYS
TRANSITION TEMPERATURE
WIRES