Abstract
Hydration products of Ca 2AlFeO 5, steam cured at 72 C, have been identified using X-ray diffraction and Mössbauer spectroscopy. Iron-bearing phases are hydrogarnet Ca 3Fe yAl 2−y(OH) 12 with y = 0.22, and non-crystalline ferrihydrite Fe(OH) 3.nH 2O. These two are readily distinguished in Mössbauer spectra at 4.2 K where they give, respectively, a single unsplit absorption line and a magnetically split hyperfine pattern with H hf = 501 kOe. Addition of 5 wt% lime to the calcium aluminoferrite increases the proportion of iron in the hydrogarnet to y = 0.32 while leaving the ferrihydrite unchanged, whereas 5 wt% gypsum eliminates iron from the hydrogarnet entirely and produces an even more disordered non-crystalline ferric hydrate.
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