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Journal of Materials Science

, Volume 26, Issue 18, pp 5053–5059 | Cite as

Determination of the Al/Si distribution in synthetic KxMg2Al4+xSi5−xO18 (0< x ⩽1) cordierites by 29Si and 27Al MAS-NMR spectroscopy

  • J. Senegas
  • A. R. Grimmer
  • D. Muller
  • P. Thomas
  • D. Mercurio
  • B. Frit
Papers

Abstract

29Si magic angle spinning-nuclear magnetic resonance study of three samples of potassium-substituted hexagonal cordierites with KxMg2Al4+xSi5−xO18 formula (x=0.25, 0.50, 1) has allowed the determination, in each case, of the distribution of aluminium and silicon atoms among the tetrahedral framework sites. It has been shown that the excess of aluminium compensating for the insertion of potassium within the hexagonal channels is accommodated by only the T(2) sites of the six-membered rings. A short-range order, which decreases with increasing potassium content, has been evidenced, in agreement with the results from the Rietveld refinement of neutron diffraction data.

Keywords

Hexagonal Diffraction Data Neutron Diffraction Cordierite Silicon Atom 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1991

Authors and Affiliations

  • J. Senegas
    • 1
  • A. R. Grimmer
    • 2
  • D. Muller
    • 2
  • P. Thomas
    • 3
  • D. Mercurio
    • 3
  • B. Frit
    • 3
  1. 1.Laboratoire de Chimie du Solide du C.N.R.S.Université de Bordeaux ITalence CedexFrance
  2. 2.Central Institute of Inorganic ChemistryAcademy of Sciences of the GDRBerlinGermany
  3. 3.Faculté des SciencesLaboratoire de Chimie Minérale Structurale (U.A.-C.N.R.S. no. 320)Limoges CedexFrance

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