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High-Resolution TEM Investigation of Halloysite

Published online by Cambridge University Press:  02 July 2020

Chi Ma  and
Richard A. Eggleton
Chi Ma
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA91125
Richard A. Eggleton
Affiliation:
Department of Geology, Australian National University, Canberra, ACT0200, Australia
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Extract

Halloysite has long been regarded as being highly-disordered or even turbostratic structurally. TEM study of halloysite in the past showed little detail in the basal fringes due to rapid beam damage. Most TEM images of halloysite with various morphologies reported in recent literature are at low-magnification. In this study, tubular halloysites from six localities in Australia and New Zealand were intensely examined with HRTEM and electron diffraction using a JEOL 200CX. The results are presented in this paper.

Tubular halloysite (Fig. la) HRTEM images recorded show a 7-Å fringe spacing (Fig. lb), which suggests that halloysite has lost its all interlayer water and has collapsed under the high-vacuum conditions in the TEM. The 7-A lattice fringes revealed on the walls of halloysite tubes are similar to those of kaolinite stacks, and exhibit relatively straight layers with fewer defects compared with smectite fringes.

Type
Ceramics & Minerals
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 416 - 417
Copyright
Copyright © Microscopy Society of America

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