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Transmission Electron Microscopy of Synthetic 2- and 6-Line Ferrihydrite

Published online by Cambridge University Press:  28 February 2024

Dawn E. Janney ,
John M. Cowley  and
Peter R. Buseck
Dawn E. Janney
Affiliation:
Department of Geology and Chemistry/Biochemistry and Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287, USA
John M. Cowley
Affiliation:
Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287, USA
Peter R. Buseck
Affiliation:
Department of Geology and Chemistry/Biochemistry and Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287, USA
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Abstract

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High-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), annular dark-field scanning transmission electron microscope (STEM) images, and electron nano-diffraction were used to examine structures of synthetic 2- and 6-line ferrihydrite specimens. HRTEM images of 2-line ferrihydrite (2LFh) show scattered small (~1-3 nm) areas with lattice fringes surrounded by areas free of fringes. All SAED patterns show two bright rings corresponding to d-values of ~0.15 and 0.25 nm; each ring has a conspicuous shoulder on each side. Faint rings corresponding to d-values of 0.08, 0.095, 0.100, 0.106-0.114 (very broad ring), and 0.122 nm are visible in strongly exposed SAED patterns. Nanodiffraction patterns show conspicuous streaks and a lack of superlattice formation.

HRTEM images of 6-line ferrihydrite (6LFh) display larger crystallites (typically ~5-6 nm) with lattice fringes visible in many thin areas. SAED patterns show rings corresponding to d-values of 0.148, 0.156, 0.176, 0.202, 0.227, and 0.25-0.26 nm and a shoulder extending between d-values of ~0.25 and 0.32 nm. Faint rings corresponding to d-values of 0.086, 0.093, 0.107, 0.112, 0.119, 0.125, and 0.135 nm are visible in strongly exposed SAED patterns. Small quantities of hematite, magnetite or maghemite, and an acicular material tentatively identified as goethite were observed in the 6-line ferrihydrite, but these quantities do not contribute significantly to the overall diffracted intensity from the sample.

Keywords

FerrihydriteHigh-Resolution Transmission Electron Microscopy (HRTEM)NanodiffractionSelected-Area Electron Diffraction (SAED)
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 1 , February 2000 , pp. 111 - 119
Copyright
Copyright © 2000, The Clay Minerals Society

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