TITLE

Hot isostatic pressing of powder in tube MgB[sub 2] wires

AUTHOR(S)
Serquis, A.; Civale, L.; Hammon, D. L.; Liao, X. Z.; Coulter, J. Y.; Zhu, Y. T.; Jaime, M.; Peterson, D. E.; Mueller, F. M.; Nesterenko, V. F.; Gu, Y.
PUB. DATE
April 2003
SOURCE
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2847
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The critical current density (J[SUBc]) of hot isostatic pressed (HIPed) MgB[SUB2] wires, measured by dc transport and magnetization, is compared with that of similar wires annealed at ambient pressure. The HIPed wires have a higher J[SUBc] than the annealed wires, especially at high temperatures and magnetic fields, and higher irreversibility field (H[SUBirr]). The HIPed wires are promising for applications, with J[SUBc] > 10[SUP6] A/cm[SUP2] at 5 K and zero field and >10[SUP4] A/cm[SUP2] at 1.5 T and 26.5 K, and H[SUBirr] ∼ 17 T at 4 K. The improvement is attributed to a high density of structural defects, which are the likely source of vortex pinning. These defects, observed by transmission electron microscopy, include small angle twisting, tilting, and bending boundaries, resulting in the formation of subgrains within MgB[SUB2] crystallites.
ACCESSION #
9555495

 

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