Abstract
This paper reports a reflection high-energy electron diffraction investigation of the surface structures of the (001) and (110) crystal faces of SrTiO 3 given various surface treatments. The as-polished surface has a (1×1) unreconstructed structure on both the (001) and (110) crystal faces. The vacuum annealed surface has a two-domain (2×1) superstructure on the (001) face and a (4×4) structure on the (110) face. The oxygen annealed surface has two superstructures on the (001) face: a two-domain (√13×√13-R33.7°) structure and a c(6×2) structure, and a (4×2) or a (4×4) structure on the (110) face. Of these surfaces, the oxygen annealed surface has the highest quality.
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