Phase composition of the rapidly quenched melt of YBa2Cu3O7-y+20 mol% Y2BaCuO5

Riches, J.D., Alarco, J.A., & Barry, J.C. (1999) Phase composition of the rapidly quenched melt of YBa2Cu3O7-y+20 mol% Y2BaCuO5. Physica C : Superconductivity and its Applications, 312(1-2), pp. 21-27.

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Abstract

Samples of YBa2Cu3O7-y+20 mol% Y2BaCuO5, with thicknesses ranging between 50-250 μm, have been melt processed and rapidly quenched from temperatures between 985 and 1100°C by immersing them in liquid nitrogen. The phase composition and microstructures of these samples have been characterised using a combination of X-ray diffractometry, optical microscopy and scanning electron microscopy with energy dispersive X-ray spectroscopy. The quenched melt of samples quenched from temperatures greater than 985°C appears relatively homogeneous but consists of Ba2Cu3Ox (BC1.5) and BaCu2O2 (BC2) regions. At about 985°C, BaCuO2 (BC1) crystallises from the melt and most of the BC1.5 decomposes into BC1 and CuO or into BC1 and BC2. The crystallisation of BC1 induces segregation of elements in the melt and this is very significant for the melt texturing of YBCO.

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ID Code: 64047
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By (since 1996):6
Export Date: 5 November 2013
Source: Scopus
CODEN: PHYCE
Language of Original Document: English
Correspondence Address: Riches, J.D.; Department of Physics, The Univ. of Queensland, St. Lucia, Brisbane, QLD 4072, Australia; email: riches@physics.uq.edu.au
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Keywords: 64.75.+g (solubility, segregation and mixing, phase separation), 74.72.Bk (Y based cuprates), Phase equilibria, Solidification, YBa2Cu3O7-y, Barium copper oxide, Barium compounds, Crystal microstructure, Crystalline materials, Crystallization, Optical microscopy, Phase composition, Quenching, Scanning electron microscopy, X ray diffraction analysis, Yttrium barium copper oxides, Oxide superconductors
DOI: 10.1016/S0921-4534(98)00661-3
ISSN: 0921-4534
Divisions: Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 06 Nov 2013 23:26
Last Modified: 06 Nov 2013 23:31

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