Abstract

We report the effect of annealing of sapphire substrate surfaces and explain the development of step patterns with large terraces. Furthermore, the epitaxial growth of Nb(110) on annealed and unannealed sapphire substrates is studied by AFM and x-ray methods. For the explanation of the well known two component line shape of transverse x-ray scans across Nb(110) Bragg peaks, a structural model is suggested.

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