| Popis: |
A tungsten crystal with a curved surface (radius of curvature = 0.2 μm), exposed to 1.3 ± 0.2 L of oxygen, undergoes massive atomic rearrangement upon annealing. Hill-and-valley faceting in the form of {2 1 1} steps is observed between (2 1 1)–(1 2 1), (1 2 1)–(1 1 2), (1 1 2)–(2 1 1) crystal facets. As the annealing temperature is increased, the number of steps decreases. Finally only one step remains and the crystal assumes a globally faceted shape for temperatures between 1400 and 1600 K. For higher temperatures the number of steps increases with temperature. |
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