Growth and characterization of homogeneous YBa2Cu3O(7-delta) powders prepared by a freeze-drying method
Abstract
Homogeneous superconducting powders of YBa2Cu3O(7-delta) have been successfully prepared from a carbonate solution by means of a freeze-drying method. Sintered powders at 930 C were characterized by 100 percent volume fraction of the superconducting phase in measurements of field-cooled magnetization at 4.5 K in low fields using a SQUID magnetometer. It turned out that large plate-shaped grains (about 2 x 5 x 20 cu microns) grew when the powders were heated in a short period (greater than about 6 hours) and that the packing density was considerably high even without any pressing process.
- Publication:
-
Japanese Journal of Applied Physics
- Pub Date:
- August 1990
- DOI:
- Bibcode:
- 1990JaJAP..29L1409K
- Keywords:
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- Crystal Growth;
- Freeze Drying;
- High Temperature Superconductors;
- Magnetization;
- Mixed Oxides;
- Barium Oxides;
- Copper Oxides;
- Heat Treatment;
- Magnetometers;
- Sintering;
- X Ray Diffraction;
- Yttrium Oxides;
- Solid-State Physics