Electron-beam-induced reduction of Mn4+ in manganese oxides as revealed by parallel EELS

Laurence A.J. Garvie, Alan J. Craven

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

Chemical reduction of Mn4+ in the mineral asbolan was examined using parallel electron energy-loss spectroscopy (PEELS). Changes on the oxidation state of the manganese were monitored by recording the electron energy-loss near-edge structure (ELNES) for the Mn M2,3- and L2,3-edges. The edges in the undamaged material were consistent with Mn4+. Electron beam irradiation of the mineral caused the ionisation edges to change in shape and energy consistent with the decrease in the proportion of the Mn4+ and the increase in the proportions of Mn3+ and Mn2+. The final edge is very similar in energy and shape to that of Mn2+ in rhodochrosite (MnCO3) and manganosite (MnO) and the differences in shape can be accounted for by the presence of a small amount of residual Mn3+.

Original languageEnglish (US)
Pages (from-to)83-92
Number of pages10
JournalUltramicroscopy
Volume54
Issue number1
DOIs
StatePublished - May 1994
Externally publishedYes

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Electron-beam-induced reduction of Mn<sup>4+</sup> in manganese oxides as revealed by parallel EELS'. Together they form a unique fingerprint.

  • Cite this