Mechanically alloyed Al-I composite materials

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Abstract

Mechanically alloyed aluminumiodine composites with iodine concentrations from 4 to 17 wt% were prepared from elemental aluminum and iodine. A reference sample was prepared from aluminum and AlI3. A shaker mill and an attritor mill, operating at both room temperature and liquid nitrogen temperature, were used for preparation. Materials were characterized by electron microscopy and X-ray diffraction. The iodine release upon heating was studied using thermogravimetry. Mechanical alloying was found to be effective for preparation of AlI composites that do not release iodine until the material is brought to high temperatures. Mechanical alloying in nitrogen gas at liquid nitrogen temperature was more effective in preparing stabilized AlI composites than milling at room temperature. Iodine was not retained in materials milled directly in liquid nitrogen. In addition to poorly crystalline AlI3, other iodine compounds were present in the products. Assuming that the products are similar to other mechanically alloyed materials, it is expected that iodine is mixed with aluminum on the atomic scale, forming metastable AlI compounds where iodine may be bonded to aluminum more strongly than in AlI3, explaining why their thermal decomposition and respective iodine release occur at higher temperatures compared to decomposition and boiling of AlI3.

Original languageEnglish (US)
Pages (from-to)1213-1220
Number of pages8
JournalJournal of Physics and Chemistry of Solids
Volume71
Issue number9
DOIs
StatePublished - Sep 1 2010

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • A. Inorganic compounds
  • A. Nanostructures
  • C. Thermogravimetric analysis
  • C. X-ray diffraction

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