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Investigation and Characterization of Water-Recrystallized Croconic Acid

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Technical Report,01 Jan 2016,31 Oct 2016

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US Army Research Laboratory Aberdeen Proving Ground United States

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A high-pressure phase of croconic acid is being investigated as a novel energetic material. When pressed at high pressures 5.5 GPa, as-received croconic acid transforms into a beta-phase that is recoverable to ambient conditions. This phase has a higher density and heat of combustion than the as-received material. Rectangular crystals, which are darker than the original powder, can be observed in the recovered material and are thought to indicate formation of the beta-phase. When croconic acid is recrystallized from water at ambient conditions, similar appearing crystals are observed. We performed experiments to investigate the plausibility of recovering the beta-phase croconic acid from water recrystallization as an alternative to the high-pressure synthesis. Thermal analysis, bomb calorimetry, X-ray diffraction, and Raman spectroscopy were performed on water-recrystallized croconic acid to determine whether or not it is the beta-phase. We found that the water-recrystallized material is not the beta-phase and at present high pressures is still required for beta-phase formation.

Subject Categories:

  • Physical Chemistry
  • Crystallography
  • Thermodynamics

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