Development of A-15 (V/sub 3/Ga) superconducting material through controlled precipitation

Journal Article · Thu May 01 04:00:00 EDT 1980 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.327940· OSTI ID:5396238

Hong, M; Dietderich, D; Morris, Jr, J W

A monolithic process has been used to produce superconducting materials by controlled precipitation of the A-15 (V/sub 3/Ga) phase inside the bcc matrix of a V-rich solid solution. Ingots of V-(17approx.19 at.%)Ga were prepared by arc melting, homogenization, and quenching, were deformed at intermediate temperature into tape, and were aged at temperatures in the range 600--1000 /sup 0/C to precipitate the A-15 phase. The maximum critical transition temperature (approx.14.8 /sup 0/K) was found in materials aged at temperatures of 750 /sup 0/C or below. At these aging temperatures the T/sub c/ initially increases with aging time, and passes through a distinct maximum. The source of the exceptionally high T/sub c/ is not clear, but may be attributable to a combination of high solute content and internal strain in the small A-15 precipitate particles.

• Research Organization: Department of Materials Science and Mineral Engineering and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5396238
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 51:5; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AGING
BCC LATTICES
BETA-W LATTICES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DISPERSIONS
FABRICATION
HIGH TEMPERATURE
MELTING
MIXTURES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRECIPITATION
QUANTITY RATIO
QUENCHING
SEPARATION PROCESSES
SOLID SOLUTIONS
SOLUTIONS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TIME DEPENDENCE
TRANSITION TEMPERATURE
VERY HIGH TEMPERATURE