Fabrication of Y-Ba-Cu-O superconductor for magnetic bearing

Conference · Wed Mar 01 04:00:00 EST 1989 · IEEE Trans. Magn.; (United States)

OSTI ID:5969422

Itoh, M; Ishigaki, H; Hida, A

Although high Tc oxide superconductors, such as Y-Ba-Cu-O, should have high possibilities to be applied to repulsive magnetic bearings, various kinds of improvements on the mechanical and electrical properties of the materials have to be done. In this study, the authors tried to improve these properties by changing compression pressure in the process used in forming a pellet systematically and by adding Ag powder to Y-Ba-Cu-O powder. All materials used here were confirmed as Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7/ by X-ray diffraction analysis. Density, hardness, temperature of zero resistance, and a ratio of resistivity at a temperature of 300 K and that at temperature of 100 K increase as the compression pressure becomes higher. On the other hand, a temperature of resistance drop and a repulsive force due to Meissner effect are insensitive to the pressure. Ag content in the pellets makes the temperature of zero resistance higher. In the process of this study, it was found that the ratio of resistivity had a possibility to be used as a criterion for better superconductive characteristics.

• Research Organization: 9302170
• OSTI ID: 5969422
• Report Number(s): CONF-880812-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: 25:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
656100 -- Condensed Matter Physics-- Superconductivity
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BEARINGS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
FABRICATION
IMPEDANCE
MAGNETIC BEARINGS
MATERIALS
MATRIX MATERIALS
OXIDES
OXYGEN COMPOUNDS
PELLETS
PHYSICAL PROPERTIES
POWDERS
SCATTERING
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES