Detonation of Nitrogen Iodide, NI3NH3

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Scientific paper

WHEN moist nitrogen iodide is suspended in air over phosphorus pentoxide in a glass vessel and the vessel evacuated by a mercury vapour pump, the crystals detonate as soon as they become dry. On the other hand, the substance can be completely decomposed into iodine and permanent gases without detonation occurring if the pressure of the permanent gases be not allowed to fall below 2 × 10-3 cm. At room temperature the decomposition can be com-pleted in 12-24 hours. On carrying out the decomposition at -20° C. there is little reaction until the water is removed, after which the pressure rises linearly for a time. As iodine begins to condense out on the walls of the glass vessel, the rate of evolution of gas decreases and ultimately the pressure reaches a constant value, although some nitrogen iodide is still undecomposed. After this steady state is reached, on subjecting the residue to a hard vacuum it detonates. On detonation, the amount of permanent gas produced is only 30-50 per cent of that liberated during the thermal decomposition.

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