Control of grain size and morphology of fluor-phlogopite crystals in the solidification of a melt

Yasuhiro Kojima, Kenji Matsuo, Kunihiko Nakashima, Kenji Morinaga

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Abstract

On the basis of a TTT diagram during solidification of a melt in the system SiO2-Al2O3-MgO-MgF2-K2O-B2O3, the effect of the heat treatment conditions on grain size, morphology and crystallization degree of fluor-phlogopite is discussed. By isothermal heat treatment in the range 1253 to 1473 K, fluor-phlogopite as spherical grains was crystallized directly from a supercooled liquid. Below 1253 K, spinodal decomposition-type phase separation occurred as a prelude to crystallization. Energy dispersive X-ray analysis suggested that the growth rate was controlled by diffusion of Mg ions. A linear relationship between the spinodal wave length and the plate diameter was obtained.

Original languageEnglish
Pages (from-to)172-179
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume55
Issue number2
DOIs
Publication statusPublished - Jan 1 1991

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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