Samples of calcium and magnesium nitrides have been prepared and hydrolysed ‘dry’ with water vapour and steam or ‘wet’ with liquid water. Changes in phase composition, surface area, crystallite and aggregate sizes have been correlated with hydrolysis conditions and compared with ‘dry’ and ‘wet’ hydration of lime and magnesia. The reactions involve the splitting of nitride and oxide crystallites and the subsequent ageing of the newly formed calcium and magnesium hydroxides. Hydrolysis of calcium cyanamide has been studied similarly. The intermediate product, hydrated lime, has been separately reacted with urea solutions and gives calcitic rhombs having a wide crystallite size range.
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Glasson et al. (1968) studied this question.
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