Modeling superconductor degradation using magnetic levitation
- The University of Texas at El Paso, El Paso, Texas (US). Department of Metallurgical and Materials Engineering
Corrosion of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} pellets has been studied using magnetic levitation. Pellets compressed at green compaction pressures of 120--200 MPa were exposed to water and air and the levitation heights were measured over a period of more than a month. A model based on diffusion as a rate-controlling step has been proposed. Levitation height normalized with respect to the initial levitation height was used as the modeling parameter. The experiments indicate that the normalized levitation height decreased with time up to a certain level called the saturation leviation, beyond which there is no change in the levitation height. Samples in air degraded faster than samples in water. The initial period of degradation before saturation fits the proposed model well and therefore appears to be diffusion controlled. The saturation levitation shows a dependence on the green compaction pressure. It has been proposed that corrosion (degrading reactions) is due to open porosities which are closed by the reaction products, thus causing a saturation in the levitation height dependent on the porosities.
- OSTI ID:
- 6258269
- Journal Information:
- Applied Physics Letters; (USA), Vol. 58:11; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
CORROSION
MAGNETIZATION
SUPERCONDUCTIVITY
COPPER OXIDES
YTTRIUM OXIDES
HIGH-TC SUPERCONDUCTORS
LEVITATION
PELLETS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity