Phase Composition of Commercial "Ammonium Carbonate"

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Science  14 Jun 1963:
Vol. 140, Issue 3572, pp. 1205-1207
DOI: 10.1126/science.140.3572.1205


A unique crystalline phase was the sole constituent in newly opened containers of commercial reagent-grade "ammonium carbonate." The chemical composition, optical constants, x-ray powder diffraction pattern, infrared absorption spectrum, and density indicate a double salt, ammonium bicarbonate-carbamate (NH4HCO3·NH4 CO2NH2), which is unstable in air at ambient temperature and decomposes rapidly to ammonium bicarbonate.