Abstract
Abstract Constituents of gases evolved in thermal decomposition of ammonium chromate and ammonium dichromate have been studied by an omegatron mass spectrometer. From the data of gas analysis, the following conclusions have been obtained. The decomposition of the first step started with proton transfer mechanism and the ratio of NH3 to H2O was not 2 : 1 at the beginning. The second step corresponded to the formation of N2, N2O, and H2O through oxidation of NH3 by the chromate anion. The decomposition in the third step was accompanied by the evolution of oxygen molecules. The production of CrO3 was confirmed by comparing the dissociation pressure of CrO3 produced in AC decomposition with that of pure CrO3. The decomposition in the last step corresponded to the process from CrO2 to Cr2O3, with the evolution of O2, CO2, and CO.
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