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Synthesis of Expandable Fluorine Mica From Talc

Published online by Cambridge University Press:  28 February 2024

Hiroshi Tateyama ,
Satoshi Nishimura ,
Kinue Tsunematsu ,
Kazuhiko Jinnai ,
Yasuo Adachi  and
Mitsuru Kimura
Hiroshi Tateyama
Affiliation:
Government Industrial Research Institute, Kyushu, Shuku-machi, Tosu city Saga prefecture, 841, Japan
Satoshi Nishimura
Affiliation:
Government Industrial Research Institute, Kyushu, Shuku-machi, Tosu city Saga prefecture, 841, Japan
Kinue Tsunematsu
Affiliation:
Government Industrial Research Institute, Kyushu, Shuku-machi, Tosu city Saga prefecture, 841, Japan
Kazuhiko Jinnai
Affiliation:
Government Industrial Research Institute, Kyushu, Shuku-machi, Tosu city Saga prefecture, 841, Japan
Yasuo Adachi
Affiliation:
Government Industrial Research Institute, Kyushu, Shuku-machi, Tosu city Saga prefecture, 841, Japan
Mitsuru Kimura
Affiliation:
CO-OP Chemicals Co. Ltd., 1-23-3, Chiyoda-ku, Tokyo, 102, Japan
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Abstract

Expandable fluorine micas were synthesized using talc and Na2SiF6 at 800°C for 2 hours in air, nitrogen, argon, and under vacuum. Gaseous SiF4, generated from Na2SiF6, and the resultant amorphous sodium silicofluoride formed during the reaction between talc and Na2SiF6 below 900°C are taking active part in the formation of expandable micas because the intensity of the 12.5 Å reflection of expandable micas decreases as the gas flow increases in the furnace. Expandable micas seem to be formed by the transformation from talc taking place without the entire disruption of the original atomic arrangement. This takes place with the loss of one Mg2+ from an octahedral site and by the intercalation of every two Na+ into the interlayer site of talc. Infrared absorption and thermal analyses show that expandable micas include a small amount of OH− in their structures.

Keywords

Expandable micaFluorineIntercalationSynthesisTalc
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 2 , April 1992 , pp. 180 - 185
Copyright
Copyright © 1992, The Clay Minerals Society

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