Hydrazinium perchlorates, thermal decomposition

A manometric technique was used to measure the rate of pressure rise which in turn is a measure of the rate of formation of volatile products produced during the thermal decomposition of hydrazinium monoperchlorate and hydrazinium diperchlorate. Kinetic expressions were developed, temperature coefficients were determined, and an attempt was made to interpret these in terms of current theories of reaction kinetics. The common rate-controlling step in each case appears to be the decomposition of perchloric acid into active oxidizing species. The reaction rate is proportional to the amount of free perchloric acid or its decomposition products which are present. In addition the temperature coefficients are similar for each oxidizer and are equivalent to that of anhydrous perchloric acid. 

NICKEL CHLORIDE (7718-54-9) NiClj Violent reaction with chlorine nitrate. Mixtures with potassium produces an impact-sensitive explosive. Contact with strong acids or acid fumes produces highly toxic and corrosive HCl gas. Forms heat- or shock-sensitive explosives with ammonium nitrate. Increases sensitivity to heat, impact, or friction of hydrazinium perchlorate. Incompatible with gold, lithium, sodium, sulfur. Thermal decomposition emits toxic chloride fumes. 

Tappan BC, Brill TB (2003) Thermal decomposition of energetic materials 85 Cryogels of nanoscale hydrazinium perchlorate in resorcinol-formaldehyde. Propellants Explosives and Pyrotechnics 28(2) 72-76. Li J, Brill TB (2005) Nanostructured energetic composites of CL-20 and binders by sol-gel methods. Propellants Explosives and Pyrotechnics 31(1) 61-69. 

The findings concerning mechanism and kinetics of thermal decomposition of nitric and perchloric acids and their salts (ammonium, hydrazinium, hy-droxylammonium and metal salts) are presented in the monograph [11]. 

Figure 6.5 shows typical DTA curves of hydrazinium perchlorate hemihydrate versus Mg -doped hydrazinium perchlorate hemihydrate. It can be seen that the compound prepared by using Mg " -doped hydrazinium perchlorate hemihydrate decomposes at a lower temperature of 222 °C compared to N2H5CIO4 O.5H2O, which decomposes at 263 °C. This shows that Mg " -doped hydrazinium perchlorate hemihydrate displays different thermal properties than hydrazinium perchlorate. When the doped compound is heated, the crystal lattice is broken and Mg " " ions are displaced from its sites. This results in an increase in the concentration of defects in the lattice. The decrease in the decomposition temperature of Mg " " doped hydrazinium perchlorate compared to hydrazinium perchlorate may therefore be attributed to the production of larger... 

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