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Preparation of YBa2Cu3O7−x using barium hydroxide flux

Published online by Cambridge University Press:  31 January 2011

N. Coppa ,
A. Kebede ,
J. W. Schwegler ,
I. Perez ,
R. E. Salomon ,
G. H. Myer  and
J. E. Crow
N. Coppa
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
A. Kebede
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
J. W. Schwegler
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
I. Perez
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
R. E. Salomon
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
G. H. Myer
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
J. E. Crow
Affiliation:
Center for Materials Research, Temple University, Philadelphia, Pennsylvania 19122
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Abstract

High quality bulk YBa2Cu3O7−x was synthesized by fusing stoichiometric amounts of yttrium and copper nitrates and barium hydroxide in air, using an ordinary Bunsen burner. The starting materials go through a short-lived liquid phase yielding a solid black product which was subsequently heat treated (900 °C, 18–24 h in air, followed by 500 °C, 5 h in O2). These materials were greater than 99% phase pure with CuO as the only other phase and they exhibited a transition temperature of 92 K, a 15.5% perfect diamagnet response (field cooled). This synthesis represents an improvement over the much more labor and time intensive conventional methods in that it allows high quality materials of various compositions to be prepared quickly.

Type
Materials Communications
Information
Journal of Materials Research , Volume 5 , Issue 12 , December 1990 , pp. 2755 - 2758
Copyright
Copyright © Materials Research Society 1990

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