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Sol-Gel Synthesis of YBa2Cu3O7-& Using Yttrium, Barium and Copper Polyether Alkoxide Precursors

Published online by Cambridge University Press:  25 February 2011

Catherine J. Page ,
Carol S. Houk  and
Gary A. Burgoine
Catherine J. Page
Affiliation:
University of Oregon, Department of Chemistry, Eugene, OR 97403
Carol S. Houk
Affiliation:
University of Oregon, Department of Chemistry, Eugene, OR 97403
Gary A. Burgoine
Affiliation:
University of Oregon, Department of Chemistry, Eugene, OR 97403
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Abstract

Homogeneous solutions of yttrium, barium and copper 2-(2-methoxy)-ethoxyethoxides in 2-(2-methoxy)ethoxyethanol of appropriate lY:2Ba:3Cu stoichiometry have been prepared and used in sol-gel synthesis of YBa2Cu3O7-δ. To our knowledge, this is the first report of the preparation of a homogeneous solution of yttrium, barium and copper homoleptic alkoxides dissolved only in the parent alcohol. These solutions provide an excellent starting point for sol-gel synthesis of YBa2Cu3O7-° since the metals are mixed on the molecular scale, and because the solutions are stable with no possibility of ligand exchange to give insoluble products. Hydrolysis and careful heat treatment of gels produced from these solutions yield nearly pure tetragonal YBa2Cu3O7-δ at temperatures as low as 725°C. The preparation of these solutions and their characterization by small-angle x-ray scattering measurements and TEM are reported, as well as preliminary data pertaining to their use in the sol-gel synthesis of YBa2Cu3O7-δ.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 155
Copyright
Copyright © Materials Research Society 1992

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