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Melt Growth of High‐Critical‐Temperature Superconducting Fibers
Author(s) -
MORRIS PATRICIA A.,
BAGLEY BRIAN G.,
TARASCON JEAN MARIE,
GREEN LAURA H.,
HULL GEORGE W.
Publication year - 1988
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1988.tb05050.x
Subject(s) - materials science , superconductivity , crystallite , high temperature superconductivity , evaporation , stoichiometry , meissner effect , oxide , analytical chemistry (journal) , composite material , mineralogy , condensed matter physics , metallurgy , chemistry , physics , organic chemistry , chromatography , thermodynamics
To determine the intrinsic properties of the newly discovered high‐critical‐temperature oxide superconductors, their single crystals are necessary. Using the float‐zone technique with CO 2 laser heating, coarse‐grained polycrystalline superconducting La‐Sr‐Cu‐O fibers have been grown directly from the melt of a sintered compact. Cu‐O is lost from the liquid and can be compensated by the addition of an excess of CuO in the compact. Superconducting properties (including T c and Meissner effect), X‐ray diffraction, and EDAX indicate that the La/Sr stoichiometry is not maintained from the sintered compact to the melt‐grown material. Attempts to grow an analogous fiber in the Y‐Ba‐Cu‐O system were unsuccessful because the very high evaporation rates of the constituents precluded the maintenance of a molten zone. The results also indicate that patterning of circuits on thin films of the Y‐Ba‐Cu‐O superconductor can be achieved using laser irradiation.