SYNTHESIS OF EXPANDABLE FLUORINE MICA FROM TALC

被引：53

作者：

TATEYAMA, H ^{[1
]}

NISHIMURA, S ^{[1
]}

TSUNEMATSU, K ^{[1
]}

JINNAI, K ^{[1
]}

ADACHI, Y ^{[1
]}

KIMURA, M ^{[1
]}

机构：

[1] CO OP CHEM CO LTD,CHIYODA KU,TOKYO 102,JAPAN

来源：

CLAYS AND CLAY MINERALS | 1992年 / 40卷 / 02期

关键词：

EXPANDABLE MICA; FLUORINE; INTERCALATION; SYNTHESIS; TALC;

D O I：

10.1346/CCMN.1992.0400207

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Expandable fluorine micas were synthesized using talc and Na2SiF6 at 800-degrees-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 Na2SiF, below 900-degrees-C are taking active part in the formation of expandable micas because the intensity of the 12.5 angstrom 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 Na2+ into the interlayer site of talc. Infrared absorption and thermal analyses show that expandable micas include a small amount of OH- in their structures.

引用

页码：180 / 185

页数：6

共 15 条

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