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http://hdl.handle.net/10773/5115
Título: | Processing and characterization of thin-films of the 2-layer superconducting phase in the bi-sr-ca-cu-o system: evidence for solid-solution |
Autor: | Golden, S. J. Bloomer, T. E. Lange, F. F. Segadães, A. M. Vaidya, K. J. Cheetham, A. K. |
Palavras-chave: | films superconductors solid solutions processing bismuth |
Data: | Jan-1991 |
Editora: | Wiley Blackwell |
Resumo: | Thin films in the Bi-Sr-Ca-Cu-O system have been synthesized from liquid ethylhexanoate precursors by spin pyrolysis. An extensive solid-solution range was found for the two-Cu-layer phase through the study of c-axis-oriented, single-phase thin films fabricated on single-crystal, (100)-oriented, MgO substrates. All two-layer compositions were excess in Bi and deficient in Sr + Ca relative to the ideal 2212 composition and showed an overall cation deficiency. The solidus temperature and c lattice parameter were found to vary systematically with composition. Sharp superconductive transitions were obtained in the case of a number of different compositions with T(c) varying between 72 and 84 K. Evidence for significant compositional heterogeneities within single-phase two-layer thin films was found and the implications for superconductivity are discussed. Compositions within the solid-solution range gave single-phase, c-axis-oriented films over a wide temperature range extending from 730-degrees-C to an upper, solidus (or peritectic) temperature (780-degrees to 840-degrees-C) which is dependent on the initial starting composition. A model has been developed that describes the formation of the two-layer phase from a fugitive liquid. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/5115 |
DOI: | 10.1111/j.1151-2916.1991.tb07307.x |
ISSN: | 0002-7820 |
Aparece nas coleções: | DEMaC - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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JACS 74(1991)123-129.pdf | Documento principal | 3.01 MB | Adobe PDF |
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