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YBa2Cu3O6+δ microcrystals by extraction of a nonstoichiometric melt

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Abstract

YBa2Cu3O6+δ microcrystals are synthesized by extraction of a nonstoichiometric melt similar to that employed for crystal growth of this compound. This method uses, first, initial compositions corresponding to the field YBa2Cu3O6+δ plus liquid, and second, the interaction properties of the flux with an appropriate substrate, i.e., Y2O3. Using other substrates like alumina produces 123 microcrystals, but embedded in the residual flux; in contrast yttrium oxide reacts with this one, and it is essential for its extraction. Choosing proper conditions makes it possible to obtain relatively pure YBa2Cu3O6+δ samples made of regular pellets (size: 10 to 20 μm thickness: 3 to 6 μm). The process is discussed using the phase diagram and the concept of dissolution-reprecipitation often involved in liquid phase sintering.

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Authors and Affiliations

  1. Centre de Recherches sur la Physique des Hautes Températures, C.N.R.S., Orleans Cedex, 45071, France

    N. Pellerin, M. Gervais & P. Odier

Authors
  1. N. Pellerin
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  2. M. Gervais
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  3. P. Odier
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Pellerin, N., Gervais, M. & Odier, P. YBa2Cu3O6+δ microcrystals by extraction of a nonstoichiometric melt. Journal of Materials Research 7, 558–564 (1992). https://doi.org/10.1557/JMR.1992.0558

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  • DOI: https://doi.org/10.1557/JMR.1992.0558

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