Characterization of microstructures contributing to degradation of superconductivity in explosively fabricated high T sub c superconductors

Journal Article · Sun Sep 01 04:00:00 EDT 1991 · Materials Performance; (United States)

OSTI ID:5610385

Murr, L E; Niou, C S; Birudavolu, R; Li, W P; Advani, A H ^[1]

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1. Dept. of Metallurgical and Materials Engineering, Univ. of Texas at El Paso, El Paso, TX (US)

In this paper techniques of optical metallography, x-ray diffraction, scanning and transmission electron microscopy, and scanning acoustic tomography (microscopy) are used to examine shock-induced microstructures and microcracks in explosively fabricated YBa{sub 2}Cu{sub 3}O{sub 7} and Bi{sub 7}Pb{sub 3}Sr{sub 10}Cu{sub 15}O{sub x} superconductors. These microstructural features are related to residual degradation of superconductivity as evidenced by alterations in the resistance-temperature (R-T) signatures. Silver additions to Y-Ba-Cu-O superconducting powder is observed to reduce the residual degradation after shock wave loading, and similar manipulations of the R-T signatures are also observed for explosively fabricated and annealed Y-Ba-Cu-O and Bi-Pb-Sr-Ca-Cu-O. Transport supercurrent measured as transport critical current density (J{sub c}) is also observed to depend upon peak shock pressure.

• OSTI ID: 5610385
• Journal Information: Materials Performance; (United States), Journal Name: Materials Performance; (United States) Vol. 27:2; ISSN MTPFB; ISSN 0094-1492
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
665100 -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
665300 -- Interactions Between Beams & Condensed Matter-- (1992-)
665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
COHERENT SCATTERING
COMPOSITE MATERIALS
CRITICAL CURRENT
CRITICAL FIELD
CRYSTAL STRUCTURE
CURRENT DENSITY
CURRENTS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
FABRICATION
HIGH-TC SUPERCONDUCTORS
HYSTERESIS
MAGNETIC FIELDS
MATERIALS
MATRIX MATERIALS
METALLOGRAPHY
MICROSCOPY
MICROSTRUCTURE
PHYSICAL PROPERTIES
SCATTERING
SHOCK WAVES
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS