Structural characterisation of kaolinite : NaCl intercalate and its derivatives
Thompson, John G., Uwins, Philippa J.R., Whittaker, Andrew K., & Mackinnon, Ian D.R. (1992) Structural characterisation of kaolinite : NaCl intercalate and its derivatives. Clays and Clay Minerals, 40(4), pp. 369-380.
Kaolinite:NaCl intercalates with basal layer dimensions of 0.95 and 1.25 nm have been prepared by direct reaction of saturated aqueous NaCl solution with well-crystallized source clay KGa-1. The intercalates and their thermal decomposition products have been studied by XRD, solid-state 23Na, 27Al, and 29Si MAS NMR, and FTIR. Intercalate yield is enhanced by dry grinding of kaolinite with NaCl prior to intercalation. The layered structure survives dehydroxylation of the kaolinite at 500°–600°C and persists to above 800°C with a resultant tetrahedral aluminosilicate framework. Excess NaCl can be readily removed by rinsing with water, producing an XRD ‘amorphous’ material. Upon heating at 900°C this material converts to a well-crystallized framework aluminosilicate closely related to low-camegieite, NaAlSiO4, some 350°C below its stability field. Reaction mechanisms are discussed and structural models proposed for each of these novel materials.
Impact and interest:
Citation counts are sourced monthly from and citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.
|Item Type:||Journal Article|
|Additional Information:||GeoRef, Copyright 2009, American Geological Institute. 1993-006705 intercalation|
|Keywords:||clay mineralogy, crystal structure, high temperature, infrared spectra, kaolinite, laboratory studies, NMR spectra, sheet silicates, X-ray diffraction data|
|Subjects:||Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)|
|Divisions:||Current > Institutes > Institute for Future Environments|
|Copyright Owner:||Copyright 1992 The Clay Minerals Society|
|Copyright Statement:||Reproduced with kind permission of The Clay Minerals Society, publisher of Clays and Clay Minerals|
|Deposited On:||30 Jan 2013 04:44|
|Last Modified:||12 Nov 2013 04:03|
Repository Staff Only: item control page