Abstract
The cleaved (001) surface of Na0.82WO3, a cubic tungsten bronze, has been imaged with a scanning tunneling microscope. The periodicity of the atomic-scale contrast in these images can be described by a rectangular cell with a equal to the bulk lattice parameter and b = 2a. A crystal chemical model for the surface structure, based on the bond valence and distance-least-squares methods, has been used to show that an ordered distribution of Na in the near surface region could lead to atomic relaxations and the observed 1 × 2 structure. Based on the atomic positions predicted by this model, constant current STM images have been calculated for a variety of parameters. The experimental observations are consistent with simulated images of the W-O terminated surface.
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