Fluxoid pinning in niobium and spinodally decomposed niobium-zirconium alloys

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5490899

Moll, K P

The fluxoid pinning properties of niobium and spinodally decomposed niobium-zirconium alloys have been measured as a function of temperature between 4.2 and 9 K and applied magnetic field between 0 and H/sub c2/. Resistance ratios, transition temperatures, upper critical magnetic field values, H/sub c2/, and other superconducting parameters are also reported. The effect of grain size and deformation on the pinning force density of niobium was investigated. Oxygen contamination during the high temperature annealing of niobium resulted in a significant reduction in the pinning force density and completely outweighed the effect of grain size variation. The effect of both deformation and aging (973 K) on fluxoid pinning properties of solid solution of niobium 25 a/o zirconium and niobium 50 a/o zirconium was investigated. The pinning force density was found to increase with increasing aging time and was independent of both composition and deformation. The peak in the measured pinning force density curve was observed to increase and move to decreasing values of reduced field with increasing aging time in accordance with Kramer's model. The fluxoid pinning results were evaluated in terms of Kramer's model and an excellent correlation was found between experimental and calculated results.

• Research Organization: Pennsylvania State Univ., University Park (USA)
• OSTI ID: 5490899
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CRYSTAL STRUCTURE
DEFORMATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
GRAIN SIZE
MAGNETIC FLUX
METALS
MICROSTRUCTURE
NIOBIUM
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
SIZE
SUPERCONDUCTIVITY
TRANSITION ELEMENTS
ULTRALOW TEMPERATURE
ZIRCONIUM ALLOYS