Preparation ofα-MnO2with an Open Tunnel

Yuji Muraoka, Hiroshi Chiba, Toshiyuki Atou, Masae Kikuchi, Kenji Hiraga, Yasuhiko Syono, Shoko Sugiyama, Sadaaki Yamamoto, Jean Claude Grenier

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

A single-phaseα-MnO2without any large stabilizing cations was successfully prepared by starting from hollandite-type (NH4)xMn8O16and quenching from 440°C during heating in flowing Ar. The unit-cell dimension was determined by XRD analysis to bea=10.308(2) Å andc=2.854(1) Å. In comparison with that of the starting material (a=9.896(1) Å andc= 2.859(1) Å), theadimension increased while thecdimension changed little. No presence of ammonium ions in the structure of this specimen was shown by IR spectroscopy, the Kjeldahl analysis, or temperature-programmed-desorption (TPD) measurement. The structural change from the hollandite phase to Mn2O3was observed at 540°C. TPD analysis indicates the presence of nitrogen other than ammonium ions in the hollandite material we prepared, and also suggests that this nitrogen might have a strong chemical interaction to the hollandite structure.

Original languageEnglish
Pages (from-to)136-142
Number of pages7
JournalJournal of Solid State Chemistry
Volume144
Issue number1
DOIs
Publication statusPublished - Apr 1 1999
Externally publishedYes

Fingerprint

Temperature programmed desorption
Ammonium Compounds
tunnels
Tunnels
Nitrogen
desorption
Ions
nitrogen
preparation
Cations
Infrared spectroscopy
Quenching
ions
Positive ions
quenching
Heating
cations
heating
temperature
cells

Keywords

  • α-MnO
  • 440°C
  • ammonium ion
  • hollandite structure
  • quench

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Muraoka, Y., Chiba, H., Atou, T., Kikuchi, M., Hiraga, K., Syono, Y., ... Grenier, J. C. (1999). Preparation ofα-MnO2with an Open Tunnel. Journal of Solid State Chemistry, 144(1), 136-142. https://doi.org/10.1006/jssc.1999.8133

Preparation ofα-MnO2with an Open Tunnel. / Muraoka, Yuji; Chiba, Hiroshi; Atou, Toshiyuki; Kikuchi, Masae; Hiraga, Kenji; Syono, Yasuhiko; Sugiyama, Shoko; Yamamoto, Sadaaki; Grenier, Jean Claude.

In: Journal of Solid State Chemistry, Vol. 144, No. 1, 01.04.1999, p. 136-142.

Research output: Contribution to journalArticle

Muraoka, Y, Chiba, H, Atou, T, Kikuchi, M, Hiraga, K, Syono, Y, Sugiyama, S, Yamamoto, S & Grenier, JC 1999, 'Preparation ofα-MnO2with an Open Tunnel', Journal of Solid State Chemistry, vol. 144, no. 1, pp. 136-142. https://doi.org/10.1006/jssc.1999.8133
Muraoka Y, Chiba H, Atou T, Kikuchi M, Hiraga K, Syono Y et al. Preparation ofα-MnO2with an Open Tunnel. Journal of Solid State Chemistry. 1999 Apr 1;144(1):136-142. https://doi.org/10.1006/jssc.1999.8133
Muraoka, Yuji ; Chiba, Hiroshi ; Atou, Toshiyuki ; Kikuchi, Masae ; Hiraga, Kenji ; Syono, Yasuhiko ; Sugiyama, Shoko ; Yamamoto, Sadaaki ; Grenier, Jean Claude. / Preparation ofα-MnO2with an Open Tunnel. In: Journal of Solid State Chemistry. 1999 ; Vol. 144, No. 1. pp. 136-142.
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