ISSN:
1436-5073
Keywords:
YBaCuO
;
thin film
;
annealing
;
depth profiling
;
diffusion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Changes in element depth profiles in a YBaCuO superconducting film on a SrTiO3 substrate due to one year aging and annealing were investigated by the ion backscattering technique. Crystal perfection of the film was checked by the X-ray rocking curve method. It was found that the film was polycrystalline, with the preferred orientation of thec axis along the normal to the substrate surface with an angle dispersion of 2 °, and that the in-planea andb axes were randomly orientated. The aging experiments have shown that the oxygen content in the surface region increases with the time constant τ = 20 days. Annealing in a vacuum at 100 °C restores the initial oxygen content. After 2 hours of annealing in an oxygen atmosphere at 400 °C, an unexpectedly strong change in oxygen and copper depth profiles is observed. Since a strong correlation exists between the profile changes, a hypothesis has been advanced about the relationship between oxygen and copper transport in the process of annealing. Taking into account the polycrystalline structure of the film, one can conclude that intergrain diffusion dominates in the oxygen and copper transport.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01244548
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