Observation of the vertex-rounding transition for a crystal in equilibrium: oxygen-covered tungsten
Abstract
Equilibrium crystal shape of oxygen-covered tungsten is followed as a function of temperature using field ion microscopy. In the vicinity of the (111) region, at the temperature 97070 K, the system undergoes a phase transition from a polyhedral form (sharp edges and sharp vertex) to a rounded form (sharp edges, rounded vertex).
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