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Structural Change in Celadonite and Cis-Vacant Illite by Electron Radiation in Tem

Published online by Cambridge University Press:  01 January 2024

Toshihiro Kogure  and
Victor A. Drits
Toshihiro Kogure*
Affiliation:
Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
Victor A. Drits
Affiliation:
Geological Institute of the Russian Academy of Sciences, Pyzhevsky per 7, Moscow, Russia
*
* E-mail address of corresponding author: kogure@eps.s.u-tokyo.ac.jp
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Abstract

High-resolution transmission electron microscopy (HRTEM) images of two dioctahedral micas, celadonite and cis-vacant (cv) illite, were examined in detail to understand the effects of electron radiation on their structures during image acquisition. Celadonite, a dioctahedral mica with Fe and Mg as major octahedral cations, originally has a trans-vacant (tv) octahedral sheet but the contrast in the highresolution transmission electron microscopy (HRTEM) images indicates a different cation distribution in the sheet. Furthermore, the β angle for the 1M polytype derived from the HRTEM images is ~98.5º, which is considerably smaller than that (~100.5º) reported for celadonite. In previous works, cation migration from the tv to cv-like configurations and a decrease in the β angle after dehydroxylation of celadonite/ glauconite by heating were reported. The same phenomenon, dehydroxylation and subsequent cation migration, probably occurs by electron radiation in TEM. However, the new cation-distribution models derived from HRTEM images along the [100] and [110] directions are not in agreement. On the other hand, the contrast in a number of HRTEM images from an illite specimen in which cv-illite is dominant is the same as that for the tv-dioctahedral layer. This result is also interpreted as cation migration accompanied by dehydroxylation in TEM, as reported in heated cv-illite. The increased β angle (~102.5º) from that in the natural state (101.5º) estimated from the HRTEM images also supports this interpretation. This phenomenon is a large obstacle to the investigation of phyllosilicates containing Al-rich cv and Mg,Fe-rich tv 2:1 layers, using HRTEM.

Keywords

CeladoniteCis-vacantIlliteTEMTrans-vacant
Type
Article
Information
Clays and Clay Minerals , Volume 58 , Issue 4 , August 2010 , pp. 522 - 531
Copyright
Copyright © The Clay Minerals Society 2010

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