ChemInform Abstract: Processing and Characterization of Thin Films of the Two-Layer Superconducting Phase in the Bi-Sr-Ca-Cu-O System: Evidence for Solid Solution.
Abstract
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ChemInform Abstract
Thin films in the Bi-Sr-Ca-Cu-O system are synthesized from liquid ethylhexanoate precursors by spin pyrolysis. For single-phase two- layer thin films on (100)-MgO substrates, an extensive cation solid- solution range is found which does not include the stoichiometric 2212 composition. All the compositions within the solid-solution range exhibit significant overall cation deficiency. Sharp superconductive transitions are obtained for a number of compositions with Tc varying between 72 and 84 K. Significant compositional heterogeneities are detected in the two-layer phase and the implications for superconductivity are discussed.
