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

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12 Citations (Scopus)

Abstract

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
Volume34
Issue number7
DOIs
Publication statusPublished - Sep 2008
Externally publishedYes

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Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites

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