Abstract
The thermal decomposition of graphite ferric chloride produces graphite ferrous chloride with two quadrupole splittings for iron. One of these is the same as the single splitting in bulk FeCl 2. The other is larger and has an intensity, relative to the normal splitting, which increases with flake thickness. Both have the same isomer shift as in bulk FeCl 2. The extra doublet is believed to be caused by the presence of C1 2 trapped in certain spaces in the flake. This modifies the electric field gradient of the FeCl 2 in those regions. The normal doublet is believed to come from FeCl 2 in layer spaces containing no trapped Cl 2. Both the Mössbauer and analytical data show that the thermal stability of FeCl 3 intercalated between the carbon layers is less than that of bulk FeCl 3.
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