Observation of exsolution textures within Ba-Cu-O-rich solidified melts of Y-Ba-Cu-O materials and their relationship to Y123 nucleation and texturing

Alarco, J.A., Riches, J.D., & Barry, J.C. (2000) Observation of exsolution textures within Ba-Cu-O-rich solidified melts of Y-Ba-Cu-O materials and their relationship to Y123 nucleation and texturing. Physica C: Superconductivity and its Applications, 331(3-4), pp. 201-215.

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Abstract

Layers (about 60-100 μm thick) of almost pure BaCuO2 (BC1), as determined using X-ray diffractometry (XRD) and scanning electron microscopy (SEM), coat the surfaces of YBa2Cu3O7-x (Y123) samples partial melt processed using a single-zone vertical furnace. The actual Cu/Ba ratio of the BC1 phase is 1.2-1.3 as determined using energy dispersive X-ray spectrometry (EDS). The nominally BC1 phase displays an exsolution of BC1.5 or BC2 in the form of thin plates (about 50-100 nm thick) along {100}-type cleavage planes or facets. The exsolved phase also fills cracks within the BC1 layer that require it to be in a molten state at some stage of processing. The samples were influenced by Pt contamination from the supporting wire, which may have stabilised the BC1.5 phase. Many of the Y123 grains have the same morphology as the exsolution domains, and run nearly parallel to the thin plates of the exsolved phases, strongly indicating that Y123 nucleation took place at the interface between the BC1 and the BC1.5 or BC2 exsolved phases. The network of nearly parallel exsolved 'channels' provides a matrix and a mechanism through which a high degree of local texture can be initiated in the material.

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ID Code: 64014
Item Type: Journal Article
Refereed: Yes
Keywords: Barium compounds, Energy dispersive spectroscopy, Morphology, Nucleation, Phase diagrams, Phase interfaces, Scanning electron microscopy, Solidification, Surfaces, Textures, X ray diffraction analysis, Exsolution textures, Melt texturing, Single zone vertical furnace, Yttrium barium copper oxides
DOI: 10.1016/S0921-4534(00)00023-X
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 01:09
Last Modified: 18 Apr 2016 23:02

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