You need JavaScript to view this

THE NIOBIUM-THORIUM EUTECTIC ALLOY AS A HIGH-FIELD, HIGH-CURRENT SUPERCONDUCTOR

Abstract

Niobium-thorium eutectic alloys having fine acicuiar microstructures were produced by fast cooling frorn a vacuum melt. Although the solidified material was normal, continuity between the superconducting niobium-rich phase, which was essentially pure niobium, was attained by plastic deformation at room temperature. The resulting wire was tested for critical current at 4.2 deg K, in transverse magnetic fields up to 82.5 kilogauss; at the highest field, critical current densities of slightly more than 10/sup 4/ amps per square centimeter were observed. The critical current density was independent of applied field from 20 kilogauss to the highest field used; the level of critical current density depended on diameter in a manner that suggested dependence on cold work. It was concluded that the cold work reduced the thickness of the needles of niobium below the superconducting penetration depth, and brought them sufficiently close together to allow the superconducting correlation to interconnect the niobium, in the manner suggested by Cooper; furthermore, the constant critical current region may possibly extend to considerably higher fields. (auth)
Publication Date:
Mar 15, 1963
Product Type:
Conference
Report Number:
CONF-35-2; AED-Conf-63-024-1
Reference Number:
NSA-17-032650
Resource Relation:
Conference: American Physical Society Spring Meeting, Cambridge, MA (United States) 29-30 Mar 1963
Subject:
METALS, CERAMICS, AND OTHER MATERIALS; COLD WORKING; CONFERENCE; CONFIGURATION; COOLING; CURRENTS; DEFORMATION; EUTECTICS; LOW TEMPERATURE; MAGNETIC FIELDS; NIOBIUM ALLOYS; SUPERCONDUCTIVITY; TESTING; THORIUM ALLOYS; WIRES
Sponsoring Organizations:
Sponsor not identified
OSTI ID:
4875463
Research Organizations:
Massachusetts Inst. of Tech., Cambridge, MA (United States)
Country of Origin:
United States
Language:
English
Submitting Site:
DTIE
Size:
Pages: 15
Announcement Date:
Jul 06, 2013

Citation Formats

Cline, H. E., Rose, R. M., and Wulff, J. THE NIOBIUM-THORIUM EUTECTIC ALLOY AS A HIGH-FIELD, HIGH-CURRENT SUPERCONDUCTOR. United States: N. p., 1963. Web.
Cline, H. E., Rose, R. M., & Wulff, J. THE NIOBIUM-THORIUM EUTECTIC ALLOY AS A HIGH-FIELD, HIGH-CURRENT SUPERCONDUCTOR. United States.
Cline, H. E., Rose, R. M., and Wulff, J. 1963. "THE NIOBIUM-THORIUM EUTECTIC ALLOY AS A HIGH-FIELD, HIGH-CURRENT SUPERCONDUCTOR." United States.
@misc{etde_4875463,
title = {THE NIOBIUM-THORIUM EUTECTIC ALLOY AS A HIGH-FIELD, HIGH-CURRENT SUPERCONDUCTOR}
author = {Cline, H. E., Rose, R. M., and Wulff, J.}
abstractNote = {Niobium-thorium eutectic alloys having fine acicuiar microstructures were produced by fast cooling frorn a vacuum melt. Although the solidified material was normal, continuity between the superconducting niobium-rich phase, which was essentially pure niobium, was attained by plastic deformation at room temperature. The resulting wire was tested for critical current at 4.2 deg K, in transverse magnetic fields up to 82.5 kilogauss; at the highest field, critical current densities of slightly more than 10/sup 4/ amps per square centimeter were observed. The critical current density was independent of applied field from 20 kilogauss to the highest field used; the level of critical current density depended on diameter in a manner that suggested dependence on cold work. It was concluded that the cold work reduced the thickness of the needles of niobium below the superconducting penetration depth, and brought them sufficiently close together to allow the superconducting correlation to interconnect the niobium, in the manner suggested by Cooper; furthermore, the constant critical current region may possibly extend to considerably higher fields. (auth)}
place = {United States}
year = {1963}
month = {Mar}
}