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The Nature of Soil Kaolins From Indonesia and Western Australia

Published online by Cambridge University Press:  01 January 2024

Robert D. Hart ,
Robert J. Gilkes ,
Syamsul Siradz  and
Balwant Singh
Robert D. Hart*
Affiliation:
Department of Soil Science and Plant Nutrition, University of Western Australia, Perth W.A., 6907, Australia
Robert J. Gilkes
Affiliation:
Department of Soil Science and Plant Nutrition, University of Western Australia, Perth W.A., 6907, Australia
Syamsul Siradz
Affiliation:
Department of Soil Science, Gadjah Mada University, Yogyakarta, Indonesia 55281
Balwant Singh*
Affiliation:
Department of Soil Science and Plant Nutrition, University of Western Australia, Perth W.A., 6907, Australia
*
*E-mail address of corresponding author: [email protected]
†Department of Agricultural Chemistry and Soil Science, University of Sydney, Sydney, N.S.W. 2006, Australia
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Abstract

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Purified soil kaolins from Indonesia and Western Australia were characterized using analytical TEM, XRD, TGA and chemical analysis. The Indonesian kaolins, formed from tuff, consist of a mixture of tubular kaolin crystals with relatively low Fe concentrations and platy kaolin crystals with higher Fe concentrations. Western Australian kaolins also contained tubular and platy crystals but showed no systematic relationship of crystal morphology with Fe content. The coherently scattering domain (CSD) size of the Indonesian samples (5–6 nm for 001, i.e. c axis dimension) is remarkably consistent and is approximately half of the value for the Western Australian kaolins (9.7–13.4 nm), and both are much smaller sizes than values for the reference kaolins (15.6–27.8 nm). Coherently scattering domain sizes derived from the Scherrer equation are approximately twice the values obtained from the Bertaut-Warren-Averbach Fourier method but the results show the same pattern of variation. For the Indonesian, Western Australian and reference kaolins, the N2-BET surface area ranges 59–88, 44–56 and 5–28 m2/g; the dehydroxylation temperatures range 486–499, 484–496 and 520–544°C, the mean cation exchange capacities (CEC) are 9.4, 5.0 and 3.5 meq 100 g−1 and the surface densities of charge range 0.10–0.14, 0.08–0.10 and 0.04–0.12 C/m2. The properties of the Western Australian kaolins and Indonesian kaolins differ substantially, but kaolins within each group have similar properties. These results suggest that soil kaolin properties may be characteristic of a particular pedoenvironment and that a systematic study of kaolins in different pedoenvironments is required.

Keywords

Analytical TEMSoil KaolinXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 2 , April 2002 , pp. 198 - 207
Copyright
Copyright © 2002, The Clay Minerals Society

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