Thermal Transformations of a Fluorine Bearing Mica and Synthetic Fluor Micas

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  • UDAGAWA Shigekazu
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • URABE Kazuyori
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • IKAWA Hiroyuki
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • MIURA Naoki
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology

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Other Title
  • 天然産含ふっ素金雲母および合成ふっ素雲母の加熱変化
  • テンネンサン ガン フッソキン ウンモ オヨビ ゴウセイ フッソ ウンモ ノ

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Abstract

Thermal transformations of a fluorine bearing phlogopite and synthetic fluor micas were studied mainly by X-ray diffraction method and thermogravimetry.<BR>Two phlogopites transformed to forsterite, leucite and glass; tetrasilicic potassium fluor mica to forsterite and glass; tetrasilicic sodium fluor mica first to fluormagnesiorichterite and enstatite, and then to enstatite, forsterite and glass.<BR>The phase transformations mentioned above were discussed by means of the phase assemblage expected from the phase diagrams of oxides whose end members are derived from the chemical compositions of the micas.<BR>The difference of the decomposition temperature between phlogopites and tetrasilicic micas was discussed on the basis of the crystal structures of the micas. It is considered that higher thermal resistivity of phlogopites might be attributable to their crystal structures in which the dimensions of tetrahedral layer are larger than those of tetrasilicic micas.

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