The preparation and characterization of ferrous
An X-ray amorphous form of FeSO4,H2O was made by heating the heptahydrate at 100 degrees C under vacuum with the removal of water vapour. Crystalline FeSO4,H2O rehydrates to the heptahydrate when RH greater than 65% but the amorphous form recrystallizes as the stable tetrahydrate at RH greater than 0 and less than 65%.
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