Preparation of superconductor Y-Ba-Cu-O powder by single step calcining in air
Abstract
A combined suspension-coprecipitation powder-preparation method is described. The simultaneous coprecipitation of yttrium and copper cations in an aqueous BaCo3 suspension produced a homogeneous slurry of submicronized amorphous hydroxide particles surrounding the small BaCO3 which led to the formation of single-phase orthorhombic YBa2Cu3O(x) powders. Sintering of superconducting powder compacts at 940 C in air produced dense YBa2Cu3O(x) ceramic bodies which presented superconducting transition temperatures in the range of 87 K to 92 K. The values of critical current density (Jc) measured on sintered bulk samples were never higher than 15 A/sq cm due to the high anisotropy in Jc.
- Publication:
-
Superconductivity and Ceramic Superconductors II
- Pub Date:
- 1991
- Bibcode:
- 1991sccs.proc..165D
- Keywords:
-
- Barium Oxides;
- Copper Oxides;
- High Temperature Superconductors;
- Powder (Particles);
- Roasting;
- Yttrium Oxides;
- Diamagnetism;
- Lattice Parameters;
- Sintering;
- Superconductivity;
- Temperature Dependence;
- Transition Temperature;
- X Ray Diffraction;
- Solid-State Physics