Abstract
The thermal decomposition of cadmium hydroxynitrate, Cd(OH)(NO3 · H2O, has been investigated by means of thermograyimetry, differential scanning calorimetry, mass spectrometry and X-ray diffraction. A complete decomposition scheme is proposed. The anhydrous hydroxy salt, Cd(OH)(NO3, the product of the first stage of the decomposition, leads to cubic cadmium nitrate and cadmium oxide simultaneously in the second stage, the cadmium nitrate giving CdO in the third stage. This result can be explained on the basis of the Cd(OH)(NO3) and Cd(NO3)2 structures. This study confirms that the formation of gaseous nitric acid molecules during the decomposition of solids is specific for hydroxynitrates of divalent metals the lamellar crystalline structures of which are characterized by a stacking of hexagonal close-packed layers of formulaMX2+m, wherem=0 or 1 and X=OH−, H2O or NO 3 − .
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