Abstract
Owing to their small dimensions, conducting crystal tips with curvature radii of 10-6-10-4 cm, usually studied by field electron microscopy (FEM) techniques [1], are single-crystalline even if made from polycrystalline wire. As the crystal tip is heated, its surface atoms become mobile, with the mobility increasing with temperature. At temperatures sufficient for an appreciable probability of two-dimensional sublimation of the atoms located at the edges of close-packed planar atomic networks, the tip is blunted (the tip material is transported to its lateral surface). This process, controlled by the Laplace pressure pγ = 2γ/r, slows down drastically when a certain curvature radius, r, of the tip is reached [2, 3]; this radius is a function of temperature and surface tension γ (for example, in tungsten tips the critical radius is about 10-4 cm).
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Shrednik, V.N. (1986). Field Emission Microscopic Study of Thermal Field- and Condensation-Induced Growth Forms of Crystal Tips. In: Givargizov, E.I. (eds) Growth of Crystals. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7119-3_9
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DOI: https://doi.org/10.1007/978-1-4615-7119-3_9
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