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Formation of Expandable Mica from Talc Using the Intercalation Procedure
Author(s) -
Tateyama Hiroshi,
Tsunematu Kinue,
Noma Hideaki,
Adachi Yasuo,
Takeuchi Hideaki,
Kohyama Norihiko
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08113.x
Subject(s) - talc , mica , materials science , high resolution transmission electron microscopy , intercalation (chemistry) , composite material , layer (electronics) , mineralogy , chemical engineering , transmission electron microscopy , chemistry , nanotechnology , inorganic chemistry , engineering
To investigate the transformation process from talc to expandable micas, mixtures of talc and Na 2 SiF 6 were heated from 600° to 900°C and air‐quenched at 50°C intervals. The air‐quenched product at 800°C mainly consisted of expandable micas with a basal spacing of 1.25 nm, nonexpandable materials with a basal spacing of 0.96 nm, and a small amount of talc used as the starting material. A lattice fringe image by HRTEM of the product shows that the layer spacing at the edges surfaces is about 1.2 nm, but the layer spacing inside of the particles is close to that of talc. Such a nanostructure indicates a topotactic reaction from talc to expandable micas and confirms that Na + ions intercalate into the structure from the edge to the core.