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TitleImproved initiation technique for the metal fixed points
Publication TypeJournal Article
Year of Publication2011
AuthorsWhite, D.R., and Mason R.S.
JournalInternational Journal of Thermophysics
Pagination348 - 359
Date Published2011
ISSN0195928X (ISSN)
KeywordsDendrite growth, Dendrites, Dendrites (metallography), Fixed points, Gibbs-Thomson, Inner surfaces, Liquids, Neurons, Nucleation, Nucleation sites, Phase interfaces, Solid-liquid interfaces, Surface curvatures, Thermal coupling, Thermoelectricity, Thermometers, Tin
AbstractConventionally, the metal fixed points of indium, tin, zinc, aluminum, and silver are realized with two solid-liquid interfaces: one on the inner surface of the outside wall of the crucible and one around the thermometer well. Investigations into the practicality of inducing a single interface around the thermometer well suggest that the Gibbs-Thomson effect, due to the interface-surface curvature associated with multiple small nucleation sites on the thermometer well, is an influence effect capable of causing variations of several hundred microkelvins. Fixed-point initiation methods must therefore ensure that a complete solid-liquid interface is formed around the thermometer well. The experiments show that a single interface is satisfactory, and that there is no evidence for dendrite growth causing thermal coupling between the furnace and the thermometer. © 2010 Springer Science+Business Media, LLC.

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