Thermal Decompositon Studies Of Pre-Irradiated Nickel (II) Azides
AbstractThe effect of pre-irradiation on the thermal decomposition of three samples of nickel (II) azide was studied. It was found that the rates of thermal decomposition of Ni(OH)N3 increased substantially with increase in pre-irradiation dosage. The initial reaction rates change from time-dependant nucleation law for the unirradiated sample to a unimolecular decay law for the sample irradiated with heavy dosage. The activation energy of pre-irradiated Ni(OH)N3 increased to 117KJ mole-1 from 106.2KJ mole-1 for the unirradiated sample. Ni(N3)2 and aged Ni(OH)N3 are, however, not seriously affected even at high dosages of 24Mrad of γ–radiation. Their reaction kinetics follow the unimolecular rate law just like those of unirradiated samples. Only the irradiation of Ni(OH)N3 causes significant radiation damage. This work has shown that Ni(OH)N3, if carefully treated with calculated dosages of γ–radiation, could generate nickel azides of varying degree of stability for safe handling in various applications.
KEY WORDS: Pre-irradiation, γ-rays, azides, dislocations, radiation damage, thermal decomposition.
Global Journal of Pure and Applied Sciences Vol.11(1) 2005: 89-97