Journal of Thermal Analysis and Calorimetry

, Volume 86, Issue 1, pp 205–209 | Cite as

Thermal decomposition of hydrotalcitewith hexacyanoferrate(II) and hexacyanoferrate(III) anions in the interlayer

  • R. L. Frost
  • A. W. Musumeci
  • J. Theo Kloprogge
  • M. L. Weier
  • M. O. Adebajo
  • W. Martens
Article

Abstract

The thermal decompositions of hydrotalcites with hexacyanoferrate(II) and hexacyanoferrate(III) in the interlayer have been studied using thermogravimetry combined with mass spectrometry. X-ray diffraction shows the hydrotalcites have a d(003) spacing of 11.1 and 10.9 Å which compares with a d-spacing of 7.9 and 7.98 Å for the hydrotalcite with carbonate or sulphate in the interlayer. XRD was also used to determine the products of the thermal decomposition. For the hydrotalcite decomposition the products were MgO, Fe2O3 and a spinel MgAl2O4. Dehydration and dehydroxylation take place in three steps each and the loss of cyanide ions in two steps.

Keywords

hexacyanoferrate hydrotalcite pyroaurite takovite thermal analysis 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • R. L. Frost
    • 1
  • A. W. Musumeci
    • 1
  • J. Theo Kloprogge
    • 1
  • M. L. Weier
    • 1
  • M. O. Adebajo
    • 1
  • W. Martens
    • 1
  1. 1.Inorganic Materials Research Program, School of Physical and Chemical SciencesQueensland University of TechnologyBrisbane QueenslandAustralia

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