INVESTIGADORES
SERQUIS Adriana Cristina
artículos
Título:
Hot isostatic pressing of powder in tube MgB2 wires
Autor/es:
A. SERQUIS; L. CIVALE; D. L. HAMMON; X. Z. LIAO; J. Y. COULTER; Y. T. ZHU; M. JAIME; D. E. PETERSON; F. M. MUELLER; V. F. NESTERENKO; Y. GU
Revista:
APPLIED PHYSICS LETTERS
Editorial:
American Institute of Physics
Referencias:
Año: 2003 vol. 82 p. 2847 - 2849
ISSN:
0003-6951
Resumen:
The critical current density (Jc) of hot isostatic pressed (HIPed) MgB2 wires, measured by dctransport and magnetization, is compared with that of similar wires annealed at ambient pressure.The HIPed wires have a higher Jc than the annealed wires, especially at high temperatures andmagnetic fields, and higher irreversibility field (Hirr). The HIPed wires are promising forapplications, with Jc>10^6 A/cm2 at 5 K and zero field and >10^4 A/cm2 at 1.5 T and 26.5 K, andHirr =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 MgB2 crystallites.