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Title: Critical current and upper critical field of multifilament Nb/sub 3-x/Ta/sub x/Sn superconductor

Abstract

Superconductive wires containing 78 filaments of Nb/sub 3-x/Ta/sub x/Sn for 4--16 at. % Ta were produced using the external bronze process to yield a composite with an overall composition 21.4 wt. % Nb--Ta, 64.9 wt. % Cu, and 13.6 wt. % Sn. Reaction periods of 20 to 260 h at temperatures from 650 to 735 /sup 0/C were used. Critical-current densities over the entire wire cross section were 5 x 10/sup 4/ A/cm/sup 2/ at 14 T and 1 x 10/sup 4/ at 19.7 T, the measured H/sub c/2 was 27 T at 4.2 K for wires with 8 ..mu..m filaments containing approximately 4 at. % Ta. Single filament wires using a 13 wt. % bronze matrix were fabricated to determine the effect of Ta on reaction kinetics. The A15 layer thickness was approximately proportional to the square root of the reaction time and independent of tantalum concentration. The critical-current densities are discussed in terms of A15 grain structure, stoichiometry, filament uniformity, and H/sub c/2 enhancement.

Authors:
; ; ;
Publication Date:
Research Org.:
Intermagnetics General Corporation, Charles Industrial Park, Guilderland, New York 12084
OSTI Identifier:
7057465
Resource Type:
Journal Article
Journal Name:
J. Appl. Phys.; (United States)
Additional Journal Information:
Journal Volume: 56:3
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COPPER ALLOYS; CRITICAL CURRENT; CRITICAL FIELD; CURRENT DENSITY; FABRICATION; NIOBIUM ALLOYS; SUPERCONDUCTING WIRES; TANTALUM ALLOYS; TIN ALLOYS; HIGH TEMPERATURE; LAYERS; REACTION KINETICS; THICKNESS; ALLOYS; CURRENTS; DIMENSIONS; ELECTRIC CURRENTS; KINETICS; MAGNETIC FIELDS; WIRES; 360104* - Metals & Alloys- Physical Properties; 656102 - Solid State Physics- Superconductivity- Acoustic, Electronic, Magnetic, Optical, & Thermal Phenomena- (-1987)

Citation Formats

Schwall, R E, Ozeryansky, G M, Foner, S, and McNiff, Jr, E J. Critical current and upper critical field of multifilament Nb/sub 3-x/Ta/sub x/Sn superconductor. United States: N. p., 1984. Web. doi:10.1063/1.334013.
Schwall, R E, Ozeryansky, G M, Foner, S, & McNiff, Jr, E J. Critical current and upper critical field of multifilament Nb/sub 3-x/Ta/sub x/Sn superconductor. United States. https://doi.org/10.1063/1.334013
Schwall, R E, Ozeryansky, G M, Foner, S, and McNiff, Jr, E J. 1984. "Critical current and upper critical field of multifilament Nb/sub 3-x/Ta/sub x/Sn superconductor". United States. https://doi.org/10.1063/1.334013.
@article{osti_7057465,
title = {Critical current and upper critical field of multifilament Nb/sub 3-x/Ta/sub x/Sn superconductor},
author = {Schwall, R E and Ozeryansky, G M and Foner, S and McNiff, Jr, E J},
abstractNote = {Superconductive wires containing 78 filaments of Nb/sub 3-x/Ta/sub x/Sn for 4--16 at. % Ta were produced using the external bronze process to yield a composite with an overall composition 21.4 wt. % Nb--Ta, 64.9 wt. % Cu, and 13.6 wt. % Sn. Reaction periods of 20 to 260 h at temperatures from 650 to 735 /sup 0/C were used. Critical-current densities over the entire wire cross section were 5 x 10/sup 4/ A/cm/sup 2/ at 14 T and 1 x 10/sup 4/ at 19.7 T, the measured H/sub c/2 was 27 T at 4.2 K for wires with 8 ..mu..m filaments containing approximately 4 at. % Ta. Single filament wires using a 13 wt. % bronze matrix were fabricated to determine the effect of Ta on reaction kinetics. The A15 layer thickness was approximately proportional to the square root of the reaction time and independent of tantalum concentration. The critical-current densities are discussed in terms of A15 grain structure, stoichiometry, filament uniformity, and H/sub c/2 enhancement.},
doi = {10.1063/1.334013},
url = {https://www.osti.gov/biblio/7057465}, journal = {J. Appl. Phys.; (United States)},
number = ,
volume = 56:3,
place = {United States},
year = {Wed Aug 01 00:00:00 EDT 1984},
month = {Wed Aug 01 00:00:00 EDT 1984}
}