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Title: Melt processing and morphology of freeze-dried yba2cu3o7-x high-tc superconductors
Authors: Dierickx, D ×
Van der Biest, Omer
Rosseel, Kris
Bonn, W
Moshchalkov, Victor
Bruynseraede, Yvan #
Issue Date: Dec-1994
Publisher: Elsevier science bv
Series Title: Physica c vol:235 pages:451-452
Abstract: Although quench melt growth has been established as a suitable way to enhance the critical current density J(c) in bulk YBa2Cu3O7-x, reproducibility is difficult to guarantee. One way of eliminating the quench step, is to use starting powders consisting of an (Y2O3,Ba2Cu3Ox) mixture, which is a similar phase composition as is obtained after quenching. These precursor powders can be produced by applying a freeze drying method, combined with an optimised calcination treatment. By applying a suitable melt-process, bulk YBa2Cu3O7-x can be obtained with a range of different Y2BaCuO5 morphologies and a critical current J(c) at 77K of similar to 10(4) A/cm(2) in zero field and similar to 4*10(3) A/cm(2) in a field of 3T. Quench experiments have been performed in order to determine the influence of holding time and composition on green phase content and morphology of stoichiometric Y1.2Ba2Cu3O7-x and YBa2Cu3O7-x with 20 wt % Y2BaCuO5 excess compositions.
URI: 
ISSN: 0921-4534
Publication status: published
KU Leuven publication type: DI
Appears in Collections:Solid State Physics and Magnetism Section
Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

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