Comments on the phase diagrams and crystallisation paths of Y-Ba-Cu-O materials

Alarco, J.A., Riches, J.D., & Barry, J.C. (1999) Comments on the phase diagrams and crystallisation paths of Y-Ba-Cu-O materials. Physica C: Superconductivity and its Applications, 325(3-4), pp. 181-200.

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Abstract

Our micro structural characterisation of Y-Ba-Cu-O quenched partial melts shows that the BaCuO2 (BC1) phase is crystalline at temperatures as high as 1100°C, and that the partial melt self-establishes a micro structural gradient from the surface towards the interior of the samples, which can be associated with a gradient in an equivalent partial pressure of O2 (pO2). The extension of the Y2BaCuO5-YBa2Cu3O7-x (Y211-Y123) tie-line intersects the primary crystallisation field of BC1 first. The actual peritectic reaction that takes place is Y2BaCuO5(s) + BaCuO2(s) + 2BaCu2O2(L) + 1/2O2 → 2YBa2Cu3O6(s). Two schematic representations which allow an analysis of the pO2 dependence are given. The gradient in micro structure self-established by the sample acts as a driving force for texturing. With this new perspective gained about the actual peritectic reaction and mechanisms of melt-texturing of Y123, it is possible to explain most of the aspects about partial melt-texturing. In addition, it seems possible to devise heat treatments that may allow for the production of well-oriented single domains with very large diameters. © 1999 Elsevier Science B.V.

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ID Code: 64012
Item Type: Journal Article
Refereed: Yes
Keywords: Melt processing, Phase diagram, Solidification, Y-Ba-Cu-O
DOI: 10.1016/S0921-4534(99)00499-2
ISSN: 09214534
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 07 Nov 2013 01:16
Last Modified: 18 Apr 2016 23:03

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