Determination of manganese oxidation states in solids by electron energy-loss spectroscopy

James H. Rask, Barbara A. Miner, P R Buseck

Research output: Contribution to journalArticle

109 Scopus citations

Abstract

Electron energy-loss spectra of manganese-bearing phases vary systematically with changes in the average oxidation state of manganese. The energy region recorded, 0 to 1000 eV, includes electronic transitions from manganese and oxygen core orbitals, as well as from states that have contributions from both elements. We used a spectrometer attached to a transmission electron microscope (TEM) to obtain reference spectra from manganese metal and from manganese oxides that contain Mn2+, Mn3+, and Mn4+. Such reference spectra can be used to estimate the manganese oxidation state for uncharacterized manganese-bearing solids. Areas with diameters as small as 0.1 μm can be analyzed, thus avoiding the uncertainties associated with bulk analyses of fine-grained, heterogeneous mixtures. Similar determinations of reference energy-loss spectra for other polyvalent elements will broaden the applicability of this technique for the study of small volumes of solids.

Original languageEnglish (US)
Pages (from-to)321-326
Number of pages6
JournalUltramicroscopy
Volume21
Issue number4
DOIs
StatePublished - 1987

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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