UNIGE document Scientific Article
previous document  unige:36176  next document
add to browser collection
Title

Improved transport properties and connectivity of in situ MgB2 wires obtained by Cold High Pressure Densification (CHPD)

Authors
Rindfleisch, M.
Published in Physica C: Superconductivity and Its Applications. 2011, vol. 471, no. 21-22, p. 1119-1123
Abstract The critical current density, Jc, of in situ MgB2 wires with C4H6O5 (malic acid) has been strongly enhanced by means of Cold High Pressure Densification (CHPD) at pressures up to 2.5 GPa prior to reaction. An increase in Jc by factors 2 and 8 was observed at 4.2 and 20 K, regardless of the applied field. Densified wires were found to exhibit a higher homogeneity due to enhanced connectivity. In addition, a higher C content was found, as shown by the lattice parameter change, the decrease of Tc, the shift of the calorimetric Tc distribution and a reduced anisotropy in tapes obtained from the same wires. The higher C content in densified wires is responsible for the observed enhancement of Birr by more than 1 T, up to 11 T at 20 K. Almost isotropic Jc values were obtained for C4H6O5 added square wires of 1 × 0.6 mm2 cross section, the values of Jc(4.2 K) = 1 × 104 A/cm2 for fields // and ⊥ to the wider surface being obtained at 13.8 and 13.1 T (1 μV/cm criterion), the values for 20 K being 6.4 and 6.2 T, respectively. The method was successfully applied to mono- and multifilamentary wires with lengths up to several meters, suggesting applicability for industrial lengths.
Keywords Superconducting MgB2 wiresMalic acid additivesCold densification
Identifiers
Full text
Structures
Research group Groupe Senatore
Citation
(ISO format)
FLUKIGER, René-Louis et al. Improved transport properties and connectivity of in situ MgB2 wires obtained by Cold High Pressure Densification (CHPD). In: Physica C: Superconductivity and Its Applications, 2011, vol. 471, n° 21-22, p. 1119-1123. https://archive-ouverte.unige.ch/unige:36176

176 hits

0 download

Update

Deposited on : 2014-04-29

Export document
Format :
Citation style :