Precipitation from Gd/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub 7/ superconductor in low oxygen partial pressure

Author

Wu, H. ; Kramer, M.J. ; Dennis, K.W. ; McCallum, R.W.

Author_Institution

Ames Lab., Iowa State Univ., Ames, IA, USA

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

1731

Lastpage

1734

Abstract

Precipitation behavior of second phases from Gd/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub 7/ solid solution was studied by processing in low oxygen partial pressure. With the decrease of solid solubility in the low oxygen partial pressure, Gd/sub 2/BaCuO/sub 5/ and CuO were precipitated from the solid solution as second phases. This resulted in an increase in the superconducting transition temperature up to that of GdBa/sub 2/Cu/sub 3/O/sub 7/ and an enhancement in the critical current density. The amount and size of the second phases can be controlled by the oxygen partial pressure, processing temperature and the starting composition, thus providing a useful method to introduce flux pinning centers for the improvement of critical current density.

Keywords

barium compounds; critical current density (superconductivity); flux pinning; gadolinium compounds; high-temperature superconductors; particle size; precipitation; solid solubility; superconducting transition temperature; CuO; Gd/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub 7/ superconductor; Gd/sub 2/BaCuO/sub 5/; GdBa/sub 2/Cu/sub 3/O/sub 7/; critical current density; flux pinning centers; low oxygen partial pressure; precipitation; processing temperature; second phases; solid solubility; solid solution; starting composition; superconducting transition temperature; Critical current density; Flux pinning; High temperature superconductors; Laboratories; Magnetic materials; Neodymium; Oxygen; Solid state circuits; Superconducting materials; Superconducting transition temperature;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.620914

Filename

620914