Texture and transport in spray pyrolyzed TlBa₂Ca₂Cu₃O₉ thick films
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Author(s)
Tkaczyk, J. E.
Sutliff, J. A.
DeLuca, J. A.
Bednarczyk, P. J.
Briant, C. L.
Wang, Z. L. (Zhong Lin)
Goyal, A.
Kroeger, D. M.
Lowndes, D. H.
Specht, E. D.
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Abstract
The electron backscattering pattern technique has been applied to the microstructural investigation of Tl(1223) thick films formed by vapor-phase thallination of Ag-containing Ba–Ca–Cu–oxide precursors. For samples grown on polycrystalline YSZ, considerable biaxial alignment is found in localized, multigrain regions as wide a 100 µm or more. However, on scales above 1 mm the overall texture remains only uniaxial with the c-axes (i.e., [001]) aligned perpendicular to the plane of the substrate. On single-crystal KTaO₃ an epitaxial relationship is evident which persists to the surface of a 3 µm thick film. Modest variations in the processing protocol yield films containing grains oriented with the c-axis in the plane, resulting in the degradation of transport properties. The data suggest a growth mode in which sparse nucleation occurs at the substrate followed by rapid lateral crystallization.
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1995-09
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