Transmission electron microscopy of synthetic 2- and 6-line ferrihydrite

Dawn E. Janney, John M. Cowley, P R Buseck

Research output: Contribution to journalArticle

158 Citations (Scopus)

Abstract

High-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), annular dark-field scanning transmission electron microscope (STEM) images, and electron nanodiffraction 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.

Original languageEnglish (US)
Pages (from-to)111-119
Number of pages9
JournalClays and Clay Minerals
Volume48
Issue number1
StatePublished - 2000

Fingerprint

ferrihydrite
Electron diffraction
transmission electron microscopy
Diffraction patterns
electrons
Transmission electron microscopy
diffraction
electron
High resolution transmission electron microscopy
shoulders
Ferrosoferric Oxide
magnetite
goethite
transmission electron microscopes
Crystallites
Crystal lattices
maghemite
scanning electron microscopes
Electron microscopes
Scanning

Keywords

  • Ferrihydrite
  • High-Resolution Transmission Electron Microscopy (HRTEM)
  • Nanodiffraction
  • Selected-Area Electron Diffraction (SAED)

ASJC Scopus subject areas

  • Soil Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geochemistry and Petrology
  • Water Science and Technology

Cite this

Transmission electron microscopy of synthetic 2- and 6-line ferrihydrite. / Janney, Dawn E.; Cowley, John M.; Buseck, P R.

In: Clays and Clay Minerals, Vol. 48, No. 1, 2000, p. 111-119.

Research output: Contribution to journalArticle

Janney, Dawn E. ; Cowley, John M. ; Buseck, P R. / Transmission electron microscopy of synthetic 2- and 6-line ferrihydrite. In: Clays and Clay Minerals. 2000 ; Vol. 48, No. 1. pp. 111-119.
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