Deterioration mechanism of oxide superconductor

Author

Imai, K. ; Matsuba, H.

Author_Institution

Furukawa Electr. Co. Ltd., Yokohama, Japan

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

2045

Lastpage

2048

Abstract

Deterioration of oxide superconductors has been investigated by evaluating the critical current densities, J_c, at 77 K and the conductivity at room temperature. The oxide superconductors were exposed to both moisture and heat cycles. The authors observed slow decreases in J_c often followed by fast decreases. The experimental results indicate that an external substance penetrates into the superconductors and brings about chemical reactions to form nonsuperconducting products so that volume expansion occurs at the site causing cracks

Keywords

barium compounds; bismuth compounds; calcium compounds; cracks; critical current density (superconductivity); electrical conductivity of crystalline semiconductors and insulators; environmental degradation; heat treatment; high-temperature superconductors; strontium compounds; yttrium compounds; 300 K; 77 K; BiSrCaCuO; YBaCuO; chemical reactions; conductivity; cracks; critical current densities; deterioration; external substance; heat cycles; high temperature superconductivity; moisture; nonsuperconducting products; oxide superconductor; room temperature; volume expansion; Atmospheric measurements; Chemicals; Conductivity; Critical current density; Electrodes; Nitrogen; Stability; Temperature; Testing; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92711

Filename

92711