Hostname: page-component-5d84bcc8dc-6jkbs Total loading time: 0 Render date: 2026-09-12T15:43:13.893Z Has data issue: false hasContentIssue false

Low-temperature FTIR study of kaolin-group minerals

Published online by Cambridge University Press:  01 January 2024

Cliff T. Johnston*
Affiliation:
Crop, Soil and Environmental Sciences, Purdue University, 915 W. State Street, West Lafayette, IN 47907-2054, USA
Jessica Elzea Kogel
Affiliation:
IMERYS, Sandersville, GA 31082, USA
David L. Bish
Affiliation:
Department of Geological Sciences, Indiana University, Bloomington, IN 47405, USA
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
Haydn H. Murray
Affiliation:
Department of Geological Sciences, Indiana University, Bloomington, IN 47405, USA
*
* E-mail address of corresponding author: clays@purdue.edu

Abstract

Low-temperature FTIR spectroscopy was used to characterize the v(OH) region of kaolin-group minerals including well ordered to poorly ordered kaolins from Georgia, Brazil, and England, along with samples of discrete dickite and nacrite. Low-temperature FTIR spectra were useful in resolving dickite- and nacrite-like features present in the spectra of kaolins when cooled to <30 K. These features were not resolved at room temperature and only partially resolved at liquid N2 temperature (77 K). The room-temperature and low-temperature positions of the ν(OH) bands of kaolinite, dickite, and nacrite were linearly correlated with the interatomic OH⋯O distances and this relationship served as the basis for polytype/disorder identification. Dickite or dickite-like disorder was found in high Hinckley-Index kaolinite from Keokuk, Iowa, and from Cornwall, England. Dickite- and nacrite-like features were observed in both high- and low-Hinckley-index kaolinite and the amounts of these stacking sequences generally increased with decreasing Hinckley Index.

Information

Type
Article
Copyright
Copyright © 2008, The Clay Minerals Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable