The thermal decomposition of silver dinitramide AgN(NO2)2

Abstract

Silver dinitramide AgN(NO2)2 was prepared, and its structure was characterized by UV–Visible absorption spectra, Fourier transform infrared (FT-IR) spectra and Fourier transform Raman spectra. Its thermal decomposition process was investigated by differential scanning calorimetry and thermogravimetric analysis coupled with the gas analysis by FT-IR (EGA-FT-IR). The intermediate and final products of thermal decomposition were analyzed by FT-IR, Raman spectra and X-ray diffraction. Kissinger method and Ozawa methods were used to calculate apparent activation energy Ea, the pre-exponential constant lg A and linear correlation coefficient r. The results showed that the degradation process of AgN(NO2)2 could be divided into two stages. The first one with a mass loss of 21.86 % took place in 408–483 K, in which N2O was released and the intermediate product of thermal decomposition was AgNO3. The second stage with a mass loss of 28.24 % occurred in 483–800 K. In this process, gases NO2 and O2 were evolved and Ag was the final product of thermal decomposition. Kissinger method results: Ea = 66.59 kJ mol−1, lg A = 7.21 min−1 and r = 0.9913. Ozawa method results: Ea = 70.53 kJ mol−1, r = 0.9987.