On the internal nucleation of melting

Research output: Contribution to journalArticle

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Abstract

Crystals of quartz have been superheated by some 450°C and crystals of albite by some 185°C above their respective melting points. In all cases, melting took place by the nucleation of liquid at the external surfaces (and internal boundaries as well in the case of albite). No evidence for the internal nucleation of liquid was found at any superheat for either material. The results of quartz indicate an exceptionallu large barrier to the internal nucleation of liquid. It is suggested that this large nucleation barrier is associated with the strain energy of forming a liquid nucleus within the crystalline phase. It is also indicated that the nucleation of liquid at the external surfaces of crystals at negligible superheats suggests that the free surfaces of liquids do not per se serve as preferred nucleating sites for crystallization - and that the crystal nucleation often observed at external surfaces or internal surfaces is in fact associated with condensed second-phase impurities.

Original languageEnglish (US)
Pages (from-to)347-357
Number of pages11
JournalJournal of Non-Crystalline Solids
Volume41
Issue number3
DOIs
StatePublished - 1980
Externally publishedYes

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Melting
Nucleation
melting
nucleation
Liquids
liquids
Crystals
Quartz
crystals
quartz
Crystallization
Strain energy
melting points
Melting point
Impurities
crystallization
Crystalline materials
impurities
nuclei
energy

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

On the internal nucleation of melting. / Uhlmann, Donald R.

In: Journal of Non-Crystalline Solids, Vol. 41, No. 3, 1980, p. 347-357.

Research output: Contribution to journalArticle

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