Diffusion-controlled crystal growth in K2OSiO2 compositions

G. W. Scherer, Donald R Uhlmann

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The growth of cristobalite dendrites in two K2OSiO2 glasses containing 10.3 and 15.0 mol% K2O has been studied over a wide range of temperature. The kinetics of crystallization were linear; i.e. the growth rates were independent of time. The observed crystallization rates were consistent with a diffusion-controlled mechanism. Measurements of the tip radii of curvature of the dendrites are consistent, at low undercoolings, with the predictions of Horvay and Cahn for the growth of an isolated dendrite. However, at lower temperatures at which the dendrites are closely spaced, the predicted radii are seriously in error. A model is described which takes account of the overlapping diffusion fields of neighboring dendrites and gives improved agreement with the observed growth rates. The presence of a maximum in each of the crystal growth rate versus temperature curves has not been explained. This phenomenon is apparently related to changes in the size, shape and spacing of the dendrites, which occur in the same temperature range.

Original languageEnglish (US)
Pages (from-to)59-80
Number of pages22
JournalJournal of Non-Crystalline Solids
Volume23
Issue number1
DOIs
StatePublished - 1977
Externally publishedYes

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dendrites
Crystallization
Crystal growth
crystal growth
Chemical analysis
Temperature
Undercooling
Silicon Dioxide
crystallization
radii
supercooling
Glass
Kinetics
temperature
curvature
spacing
glass
kinetics
curves
predictions

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

Diffusion-controlled crystal growth in K2OSiO2 compositions. / Scherer, G. W.; Uhlmann, Donald R.

In: Journal of Non-Crystalline Solids, Vol. 23, No. 1, 1977, p. 59-80.

Research output: Contribution to journalArticle

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