Submicrometer Superconducting YBa2Cu3O6+x Particles Made by a Low-Temperature Synthetic Route

Evidence suggests that superconducting, orthorhombic YBa(2)Cu(3)O(6+x)+ (x greater, similar 0.5) is always produced by oxidation of the oxygen-deficient, tetragonal form (x less, similar 0.5) of this phase (commonly referred to as 123). A synthetic route whereby solution-derived, carbon-free precurs...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1989-01, Vol.243 (4887), p.66-66
Main Authors: Horowitz, H S, McLain, S J, Sleight, A W, Druliner, J D, Gai, P L, Vankavelaar, M J, Wagner, J L, Biggs, B D, Poon, S J
Format: Article
Language:English
Subjects:
Chemical synthesis
Chemistry
Inorganic compounds
Materials research
Superconductivity
Superconductors
Synthesis
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Summary:Evidence suggests that superconducting, orthorhombic YBa(2)Cu(3)O(6+x)+ (x greater, similar 0.5) is always produced by oxidation of the oxygen-deficient, tetragonal form (x less, similar 0.5) of this phase (commonly referred to as 123). A synthetic route whereby solution-derived, carbon-free precursors are decomposed at 650 degrees to 700 degrees C in inert atmosphere to yield tetragonal 123 is now available. Appropriate precursors include hydrated oxides derived from the hydrolysis of organometallic solutions and aqueous solution-derived hyponitrites. Subsequent oxidation of the tetragonal phase at 400 degrees C results in submicrometer particles of orthorhombic 123. Superconductivity (T(c) onset approximately 87 K) has been confirmed in these materials by both Meissner effect and specific-heat measurements.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.243.4887.66