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Preparation of YBa2Cu3O7−x precursors from a fused eutectic of sodium and potassium hydroxides

Published online by Cambridge University Press:  31 January 2011

Nicholas Coppa ,
Daniel H. Nichols ,
John W. Schwegler ,
J. E. Crow ,
G. H. Myer  and
R. E. Salomon
Nicholas Coppa
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
Daniel H. Nichols
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
John W. Schwegler
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
J. E. Crow
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
G. H. Myer
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
R. E. Salomon
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
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Abstract

A method for preparing YBa2Cu3O7−x from the simultaneous thermal decomposition of the nitrates of yttrium, barium, and copper in an anhydrous fused eutectic of sodium and potassium hydroxide is described. This method eliminates the need for any mechanical grinding or the introduction of carbon containing anions. Products formed are fine powders (∼1 μm) having mole ratios 1.00Y:2.00Ba:3.06Cu.X-ray diffraction analyses reveal that the initial products are Y(OH)3, BaO2, and CuO, which when air calcinated/oxygen annealed at 900–950 °C form the superconducting YBa2Cu3O7−x A mechanism is postulated for product formation as a function of reaction conditions.

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Articles
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Journal of Materials Research , Volume 4 , Issue 6 , December 1989 , pp. 1307 - 1311
Copyright
Copyright © Materials Research Society 1989

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References

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