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- W2023005152 abstract "Abstract A vapor effusion apparatus was developed to measure critical supersaturation ratios for nucleation of metal crystals on various substrates. Deposition from sodium vapor beams was studied as a function of temperature and lattice misfit between the body-centered cubic sodium crystal and the various crystalline substrates. These substrate surfaces probably were coated with adsorbed gas films. The critical supersaturation ratios for the deposition of sodium are very high, ranging from 1019 at 159°K to 1011 at 213°K. The data are fitted by a rate equation whose kinetic coefficient was derived on the basis of an adsorption and surface diffusion mechanism. This treatment leads to an evaluation of the standard free energy of adsorption of the metal atoms. The critical nucleus size is calculated from the data to be about the size of a unit cell (9 Na atoms). The potencies of the metal substrates (facecentered cubic, Ag, Pt, Cu and Ni) for catalysis of nucleation are about the same. The potency of CsCl (body-centered cubic) is much higher than that of the metal substrates, possibly indicating a smaller gas adsorption on the CsCl surface. However, there is a small decrease in catalytic potency with increase in disregistry at the higher temperatures in qualitative agreement with the Turnbull-Vonnegut theory." @default.
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- W2023005152 date "1954-05-01" @default.
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- W2023005152 title "Some observations on heterogeneous nucleation of sodium crystals from atomic beams" @default.
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- W2023005152 doi "https://doi.org/10.1016/0001-6160(54)90067-x" @default.
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