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| Format: | Artículo científico |
| Langue: | en |
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Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C.
1999
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| Accès en ligne: | https://www.redalyc.org/articulo.oa?id=94200941 |
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- Superconducting Tl-Ba-Ca-Cu-O films deposited on Ag substrates A. Morales R.T. Hernández J.L. Rojas A. De Ita C. Falcony R. Martinez M. Jergel M. García Física, Astronomía y Matemáticas Thin Tl-Ba-Ca-Cu-O (TBCCO) films were prepared on texturized silver tape in a two-step procedure. First, Ba-Ca-Cu Oprecursors were deposited from an aerosol generated ultrasonically from metalorganic solution of Ba, Ca and Cu acetylacetonates (2,4-pentanedionates) with the thickness of the order of a couple of microns. The tape texturing has been obtained by a metallurgical processing combined with the heat treatment. Pole figure measurements revealed a relatively good biaxial texturing of the substrate used. Then, second, precursors were thallinated in a 1 zone reaction chamber using a crude Tl-Ba-Ca-Cu-O pellet containing appropriate amount of Tl2O3 as a source of Tl2O. A closed-crucible method has been used for thallination. The best critical temperature Tc values of synthesized films were from the interval of 100 K to 108 K. X-ray diffraction patterns revealed a very strong grain orientation. The morphology investigation showed rectangular plate-like grains on the sample surface. X-ray diffraction and pole figure measurements revealed that these grains, besides a strong c-axis orientation, are subjected also to a relatively good a-axis orientation. It means, at least in a first approximation, that the film texturing follows the texturing of the substrate used. The optimization of biaxial texturing of both, silver substrate as well as TBCCO films grown on such substrates is currently on the way 1999 artículo científico 1665-3521 https://www.redalyc.org/articulo.oa?id=94200941 en http://www.redalyc.org/revista.oa?id=942 Superficies y vacío application/pdf Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. Superficies y vacío (México) Num.9