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

Abstract

We have investigated the homogeneity of sol-gel derived YBa2Cu3O7-δ 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 Å. 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.

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Correspondence to Carol S. Houk.

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Houk, C.S., Burgoine, G.A. & Page, C.J. Homogeneity in the Polyether Alkoxide Sol-Gel Synthesis of YBa2Cu3O7-δ. MRS Online Proceedings Library 346, 29–34 (1994). https://doi.org/10.1557/PROC-346-29

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