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Thermal Analysis as a Tool for Determining and Defining Spherical Kaolinite

Published online by Cambridge University Press:  28 February 2024

F. Javier Huertas ,
Saverio Fiore  and
José Linares
F. Javier Huertas
Affiliation:
Departamento de Ciencias de la Tierra y Quimica Ambiental-Estacion Experimental del Zaidin, CSIC, Profesor Albareda, 1-18008 Granada, Spain
Saverio Fiore
Affiliation:
Istituto di Ricerca sulle Argille-CNR, Area di Ricerca di Potenza, PO Box 27-85050 Tito Scalo (PZ), Italy
José Linares
Affiliation:
Departamento de Ciencias de la Tierra y Quimica Ambiental-Estacion Experimental del Zaidin, CSIC, Profesor Albareda, 1-18008 Granada, Spain
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Abstract

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Samples containing spherical kaolinite, synthesized under hydrothermal conditions (T = 200 °C; t = 24 h, 192 h, 720 h) from gel with Si/Al = 0.84, were studied by differential thermal analysis/thermogravimetry (DTA/TG) to provide a contribution to the mineralogical characterization of this unusual morphology. The data clearly show that dehydroxylation temperature of spherical kaolinite is lower than that of platy/lath kaolinite. It can also be used to detect the presence of spheres in the presence of the other morphologies. A rough estimation of its quantity can be obtained by TG data if spheres are present in appreciable concentrations. The results also confirm microscopic observations previously reported in the literature: spherical morphology is a discrete and metastable phase, and it is gradually dissolved along hydrothermal treatments of gels.

Keywords

Spherical KaoliniteSynthesisThermal Analysis
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 4 , August 1997 , pp. 587 - 590
Copyright
Copyright © 1997, The Clay Minerals Society

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