Microstructural studies of quenched partially-melted Y-123 materials and Y-123 with Y-211, PtO2 and CeO2 additions

Alarco, J.A., Riches, J.D., Yamashita, T., Nakon, D., Williams, B., Talbot, P.C., Barry, J.C., & Mackinnon, I.D.R. (1998) Microstructural studies of quenched partially-melted Y-123 materials and Y-123 with Y-211, PtO2 and CeO2 additions. Materials Science and Engineering : B, 53(1-2), pp. 138-142.

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Abstract

The microstructure of YBa2Cu3O7-delta (Y-123) materials partially-melted in air and quenched from the temperature range 900-1100 degrees C, has been characterized using a combination of X-ray diffractometry, optical microscopy, scanning electron microscopy, electron microprobe analyses, transmission electron microscopy and energy and wave dispersive X-ray spectrometries. The microstructural studies reveal significant changes in the character of the quenched partial-melt as a function of temperature and time before quenching. BaCu2O2 and BaCuO2 are found to co-exist in stoichiometric samples quenched from the temperature range 920-960 degrees C. Under suitable cooling conditions, large pockets of melt cristallize as BaCuO2 with an exsolution of BaCu2O2 in the form of thin plates (approximate to 50-100 nm thick) along facets. Y2BaCuO5 (Y-211) additions are associated with the formation of BaCu2O2 at 1100 degrees C. Preliminary results on the effects of PtO2 and CeO2 additions to Y-123 (and Y-123 with Y-211 additions) show that these enhace the formation of BaCu2O2 at the melting temperature of 1100 degrees C. (C) 1998 Elsevier Science S.A. All rights reserved.

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ID Code: 57459
Item Type: Journal Article
Refereed: Yes
Additional Information: ISI Document Delivery No.: ZX654
Times Cited: 5
Cited Reference Count: 20
Alarco, JA Riches, JD Yamashita, T Nakon, D Williams, B Talbot, P Barry, JC Mackinnon, IDR
International Workshop on the Processing and Applications of Superconducting (RE)BCO Large Grain Materials
Jul 07-09, 1997
Cambridge, england
Elsevier science sa
Lausanne
Keywords: partial-melt, quenching, microstructural studies, superconducting thin-films, Ba-copper oxides, crystal-growth, YBa2Cu3O7-x, mechanism
DOI: 10.1016/s0921-5107(97)00316-4
ISSN: 0921-5107
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Ceramics (091201)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Functional Materials (091205)
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: 25 Feb 2013 22:44
Last Modified: 25 Feb 2013 22:44

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