Growth and Characterization of Homogeneous YBa2Cu3O7-δ Powders Prepared by a Freeze-Drying Method
- 1 August 1990
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 29 (8A) , L1409
- https://doi.org/10.1143/jjap.29.l1409
Abstract
Homogeneous superconducting powders of YBa2Cu3O7-δ have been successfully prepared from a carbonate solution by means of a freeze-drying method. Sintered powders at 930°C were characterized by 100% volume fraction of the superconducting phase in measurements of field-cooled magnetization at 4.5 K in low fields (\lesssim2 Oe) using a SQUID magnetometer. It turned out that large plate-shaped grains (∼2×5×20 µm3) grew when the powders were heated in a short period (\gtrsim6 hours) and that the packing density was considerably high even without any pressing process.Keywords
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