Preparation of hexagonal MoO3 by "Chimie Douce" reaction with NO2

Y. Muraoka, J. C. Grenier, S. Petit, M. Pouchard

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43 Citations (Scopus)


The metastable hexagonal form of MoO3 has been successfully prepared starting from the ammonium molybdate, using a "Chimie Douce" reaction with NO2 gas. The lattice parameters of the as-prepared material were determined by XRD analysis to be : a= 10.633(2) Å and c = 3.719(1) Å. The composition of this material obtained by physical and chemical analysis is MoO3, 0.09 H2O, showing that a small amount of water molecules remained while there were no more ammonium ions in this structure. The structural transformation from hexagonal to stable orthorhombic α-MoO3 phase was observed at 350°C. It was also shown that NO2 reaction is a very useful method to remove topotactically ammonium ions from a parent structure at low temperature. This "Chimie Douce" process appears to be very promising for obtaining new metastable oxides with large tunnels or interlayer distances.

Original languageEnglish
Pages (from-to)133-148
Number of pages16
JournalSolid State Sciences
Issue number2-3
Publication statusPublished - Jan 1 1999
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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