Soluble and Volatile Precursors for the Preparation of Superconducting Films


Attempts to identify intermediates in an alkoxide-based solution route to films of the high temperature superconductor YBa2Cu3O7 reported by Fahrenholtz et al.[1] have led to the isolation of the first molecular barium-copper cluster, Ba2Cu2(OR)4(acac)4·2 HOR, R = CH2CH2OCH3. The extension of this route to the preparation of the bismuth superconductors has necessitated the investigation of bismuth alkoxide chemistry. Two separate routes to bismuth alkoxides have been examined: the metathesis of the metal halides with NaOR, (R = t-butyl, and diisopropylphenoxide) and the alcoholysis of bismuth amides, Bi(NR2)3, [R = N(SiMe3)2] The alcoholysis preparation gives high yields of several alkoxides suitable as precursors to the high Tc materials. A monomeric bismuth phenoxide, which is targeted as a volatile precursor, and a bismuth t-butoxide cluster have been isolated and stucturally characterized. Solubility and volatility studies have also been undertaken.

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    W. G. Fahrenholtz, G. M. Millar, D. A. Payne, American Ceramic Society Symp. Proc., “Ceramic Superconductors”, May 1–5 1988.

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Correspondence to Nancy N. Sauer.

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Sauer, N.N., Garcia, E. & Ryan, R.R. Soluble and Volatile Precursors for the Preparation of Superconducting Films. MRS Online Proceedings Library 180, 921 (1990).

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