Abstract
The reaction scheme of thermal decomposition for four zinc hydroxynitrates was investigated by means of differential scanning calorimetry, thermogravimetry, mass spectrometry, and radiocrystallography. The thermal transformation of Zn(OH)(NO 3) · H 2O and of Zn 3(OH) 4(NO 3) 2 involves the formation of gaseous water and nitric acid from an actual chemical reaction. This reaction is not observed for Zn 5(OH) 8(NO 3) 2 · 2H 2O and Zn 5(OH) 8(NO 3) 2. These results show that the formation of gaseous nitric acid molecules inside the solids is specific to hydroxynitrates of divalent metals M, whose lamellar crystalline structure is characterized by a stacking of hexagonal close-packed layers of formula MX 2+ m , where m = 0 or 1 and X = OH −, H 2O, or NO − 3.
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