Physiochemical Characterization of Iodine (V) Oxide: Hydration Rates
Final rept. Oct 2011-Aug 2014
AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIRECTORATE/ORDNANCE DIVISION/ENERGETIC MATERIALS BRANCH
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In the first of a series of papers on the iodine V oxide system, the chemical and physical properties associated with iodine V oxide in its anhydride I2O5 and hydrated states HI3O8 and HIO3 are examined. The three forms of the oxide have been investigated utilizing differential scanning calorimetry DSC, thermogravimetric analysis TGA, and powder X-ray diffraction PXRD. In addition, the hydration rates governing the conversion of the anhydride I2O5 to the initial hydrate HI3O8 and later to the final hydrated state HIO3 are reported and discussed. Results from this study suggest that the hydration mechanism for I2O5 to HI3O8 begins with an accelerating period described as a nucleation and growth phase followed by a decelerating period that is diffusion limited. The initial rate of hydration was observed to be governed by the nucleation and growth mechanism, which was inhibited by covering the surface of the particle with an inert metal. Based on this investigation the initial rate of hydration appears to be strongly dependent on the anhydrides available surface area which facilitates nucleation and growth of HI3O8.
- Inorganic Chemistry
- Physical Chemistry