Abstract
The decomposition of various Prussian blue samples heated both in the presence and absence of air was studied by labelling at least one of the iron environments with Mössbauer inactive 56Fe and the other iron position with natural iron containing 2·19 per cent Mössbauer active 57Fe. Prussian blue samples containing various interstitial cations were heated under vacuum for 24 hr periods in the temperature range 25–455°C. Up to 210°C, the C:N:Fe ratios remained essentially 3:3:1 indicating no decomposition. The single peak spectra observed for carbon hole iron at 25°C changed drastically at approximately 200°C giving all the peaks characteristic of both carbon and nigrogen hole iron. This scrambling of iron environments is probably due to a physical exchange of iron positions or to a flipping of the CN ligand. These samples were also heated in air, giving similar results, except that at 220°C all compounds had decomposed to an oxide of iron.
Published Version
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