STABLE NECKS ON METAL TIPS

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Abstract
On a metal tip (W, Ni, Au, Cu) heated in an electron microscope (SEM) a formation of stable necks is observed. As this does not agree with the theory, experiments are made for clarification. In situ electron microscopy (TEM, STEM, EELS) shows the existence of graphitized surface layers, which surprisingly remain stable up to near the melting point. These layers hinder a complete separation of a solid metal drop from the tip end. On the basis of this result spectacular tip and neck shape changes are explainable as an Ostwald ripening

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