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Homogeneity in the Polyether Alkoxide Sol‐Gel Synthesis of YBa2Cu3O7-δ

Published online by Cambridge University Press:  21 February 2011

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

We have investigated the homogeneity of sol‐gel derived YBa2Cu307‐s from the solution phase to the final product using transmission electron microscopy (TEM), x‐ray diffraction (XRD), and Energy Dispersive X‐ray (EDX) lateral mapping techniques. The starting solutions contain stoichiometric amounts of the metal 2‐(2‐methoxyethoxy)ethoxide components in 2‐(2‐methoxyethoxy)ethanol and appear to be homogeneous by TEM with a uniform distribution of particles having an average size of less than 40 â. Through elemental mapping we see elemental segregation in the high temperature (950 °C) products, which are orthorhombic by XRD. In elemental maps of gel samples fired to 700 °C, which are tetragonal by XRD, we also see elemental inhomogeneity within particles and phase zoning in maps of products from finely ground gels. A comparison of elemental maps and x‐ray diffraction patterns of the products from gel processing and conventional solid state processing is made.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 29
Copyright
Copyright © Materials Research Society 1998

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References

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