Abstract
A comparative study of the kinetics and mechanisms of the α → γ and ɛ → γ polymorphic transitions in polycrystalline haxanitrohexaazaisowurtzitane was performed using electron and optical microscopy, calorimetry, IR spectroscopy, and quantitative X-ray phase analysis. The kinetics of both processes is complex because of the morphology of the crystals, their defect structure, and impurities. As distinct from the ɛ → γ process, which always occurs as a single crystal-polycrystal transition (through nucleation by the dislocation mechanism with subsequent movement of the phase separation front), the α → γ process can also follow the quasi-homogeneous mechanism and occur as a single crystal-single crystal transition.
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Original Russian Text © N.V. Chukanov, V.A. Dubovitskii, V.V. Zakharov, N.I. Golovina, B.L. Korsunskii, S.A. Vozchikova, V.V. Nedel’ko, T.S. Larikova, A.V. Raevskii, S.M. Aldoshin, 2009, published in Khimicheskaya Fizika, 2009, Vol. 28, No. 5, pp. 99–107.
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Chukanov, N.V., Dubovitskii, V.A., Zakharov, V.V. et al. Phase transformations of 2,4,6,8,10,12-hexanitrohexaazaisowurtzitane: the role played by water, dislocations, and density. Russ. J. Phys. Chem. B 3, 486–493 (2009). https://doi.org/10.1134/S1990793109030233
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DOI: https://doi.org/10.1134/S1990793109030233