Abstract
It is shown experimentally that the critical explosion temperature of α-lead azide crystals in air decreases with increase in size of the crystals. The mode of decomposition of the crystals was examined with optical and scanning electron microscopy, and it was found that surface decomposition took place preferentially at localized regions; crystal breakup also occurred. Calculations of explosion temperature for the case of parallelopiped shaped particles in air were made. The predicted decrease in the explosion temperature for an increase in crystal thickness from 4 to 34 μm (minimum dimension) was 6 K, whereas the experimental value was ∼ 30 K. It is suggested that the difference between the experimental and theoretical results is due to the mode of decomposition during the preexplosion period. For crystals of thickness less than ∼ 3 μm neither explosion nor melting took place even for temperatures as high as 825 K.
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