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Morphology of Kaolinite Crystals Synthesized Under Hydrothermal Conditions

Published online by Cambridge University Press:  28 February 2024

Saverio Fiore ,
F. Javier Huertas ,
Francisco Huertas  and
José Linares
Saverio Fiore
Affiliation:
Istituto di Ricerca sulle Argille, CNR, P.O. Box 27, 85050, Tito (PZ), Italy
F. Javier Huertas
Affiliation:
Estación Experimental del Zaidín, CSIC Profesor Albareda, 1, 18008 Granada, Spain
Francisco Huertas
Affiliation:
Estación Experimental del Zaidín, CSIC Profesor Albareda, 1, 18008 Granada, Spain
José Linares
Affiliation:
Estación Experimental del Zaidín, CSIC Profesor Albareda, 1, 18008 Granada, Spain
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Abstract

Scanning electron microscopy has revealed the presence of spherical, lath and platy kaolinite in gels with Si/Al atomic ratio ranging from 1.84 to 0.76 that are hydrothermally treated under different temperature and time conditions. Hemispherical structures and excavated zones, at different stages of evolution, have been observed on the surface of the gel grains, indicating that spherical particles do not precipitate from the solution but are generated from the gels. The quantity of spherical particles depends on temperature, time and the chemical composition of the starting gel. Products from starting material with Si/Al ≈ 1 yield the highest quantity of these particles. Being metastable, sphere dissolution controls the chemistry of the solution and consequently the morphology of the precipitating crystals thus producing more elongated, curved and irregular outlines when gels with Si/Al ≈ 1 are hydrothermally treated.

Keywords

Crystal growthElectron microscopyKaoliniteLathsMorphologyPlatesSpherulesSynthesis
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 3 , June 1995 , pp. 353 - 360
Copyright
Copyright © 1995, The Clay Minerals Society

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