Characterization of nanocrystalline manganese oxide powder prepared by inert gas condensation

Chin Yi Chen, Chung Kwei Lin, Ming Hsiu Tsai, Chien Yie Tsay, Pee Yew Lee, Giin Shan Chen

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Nanocrystalline manganese oxide powders were synthesized by an inert gas condensation technique. The manganese oxide powders, prepared from vaporized metallic manganese in a helium pressure of 10 mbar, then oxidized under the oxygen pressures of 50 and 100 mbar, exhibited a mixture of β-Mn, MnO and Mn3O4 phases. X-ray diffractometry (XRD) analysis identified the predominant oxide formation of the as-prepared powder to be the phase of MnO. In situ synchrotron XRD and differential scanning calorimetry (DSC) data showed that synthesized manganese powder converts from β-Mn to MnO in the temperature range of 150-250 °C and subsequently converts to Mn3O4 above 250 °C. Transmission electron microscopy examinations confirmed that oxidation starts from the surface of the condensed β-Mn particles. Detailed valance variations of manganese of the resulting powders were investigated by synchrotron X-ray absorption spectroscopy techniques.

Original languageEnglish
Pages (from-to)1661-1666
Number of pages6
JournalCeramics International
Issue number7
Publication statusPublished - Sept 2008
Externally publishedYes


  • B. X-ray methods
  • C. Thermal properties
  • Gas phase reaction
  • In situ synchrotron X-ray diffractometry
  • Manganese oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry


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