Low-temperature FTIR study of kaolin-group minerals
Johnston, Cliff T. (Purdue University. Department of Crop Soil and Environmental Sciences)
Kogel, Jessica E. (IMERYS)
Bish, David L. (Indiana University. Department of Geological Sciences)
Kogure, Toshihiro (The University of Tokyo. Department of Earth and Planetary Science)
Murray, Haydn H. (Indiana University. Department of Geological Sciences)

Data:	2008
Resum:	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 N temperature (77 K). The room-temperature and low-temperature positions of the v(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.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Dickite ; FTIR Spectroscopy ; Hinckley Index ; Kaolin-group Minerals ; Kaolinite ; Lowtemperature FTIR Spectroscopy ; Nacrite ; Structural Disorder
Publicat a:	Clays and Clay Minerals, Vol. 56, Núm. 4 (2008) , p. 470-485, ISSN 1552-8367

DOI: 10.1346/CCMN.2008.0560408

16 p, 1.0 MB  Accés restringit a la UAB

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