Atmospheric conditions and their effect on ball-milled magnesium diboride
arXiv:cond-mat/0608692 · doi:10.1088/0953-2048/19/11/014
Abstract
Magnesium diboride bulk pellets were fabricated from pre-reacted MgB2 powder ball milled with different amounts of exposure to air. Evidence of increased electron scattering including increased resistivity, depressed Tc, and enhanced Hc2 of the milled and heat treated samples were observed as a result of increased contact with air. These and other data were consistent with alloying with carbon as a result of exposure to air. A less clear trend of decreased connectivity associated with air exposure was also observed. In making the case that exposure to air should be considered a doping process, these results may explain the wide varibability of "undoped" MgB2 properties extant in the literature.
arXiv commentWork presented at ASC 2006 in Seattle
References in corpus (12)
- Superconductivity in Dense Wires
- Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
- Thermodynamic and Transport Properties of Superconducting
- Carbon substitution in MgB2 single crystals: structural and superconducting properties
- Carbon-substituted MgB2 single crystals
- Significantly enhanced critical current densities in MgB2 tapes made by a scaleable, nano-carbon addition route
- Improved Hc2 in Bulk-Form Magnesium Diboride by Mechanical Alloying With Carbon
- Critical Current Density and Resistivity of MgB2 Films
- Multifilamentary, in-situ Route, Cu-stabilized MgB2 Strands
- Solenoidal Coils Made from Monofilamentary and Multifilamentary MgB2 strands
- Magneto-optical studies of the uniform critical state in bulk MgB2
- Resistivity and Magneto-Optical Evidence for Variable and Incomplete Connectivity in Dense, High Critical Current Density C-alloyed Magnesium Diboride