Abstract
The thermal decomposition of metal(III) hexacyanoferrates(II) (Al, As, Sb, Bi) was studied up to 700° in air by employing Mössbauer, infrared spectroscopy and thermal analysis techniques. With the exception of the bismuth compound, the isomer shift of these hexacyanoferrates(II) increases on dehydration at 200°. Dehydration is complete at 200°, decomposition into the ferrite at 300°, and formation ofα-Fe2O3 from aluminium and bismuth hexacyanoferrates(II) and Fe3O4 from antimony and arsenic hexacyanoferrates(II) at 700°.
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