High-Temperature Structural Transformations of 1,1-Diamino-2,2-dinitroethene (FOX-7)
| Autor: | N. N. Volkova, Nikita V. Chukanov, B. L. Korsounskii, A. D. Chervonnyi, Nadezdha N. Dremova, Gennadiy V. Shilov, V. V. Zakharov, Anatoliy I. Kazakov |
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| Rok vydání: | 2016 |
| Předmět: |
010304 chemical physics
Chemistry General Chemical Engineering Thermal decomposition Infrared spectroscopy Isothermal titration calorimetry General Chemistry Atmospheric temperature range 010402 general chemistry 01 natural sciences 0104 chemical sciences Crystallography FOX-7 chemistry.chemical_compound Perfect crystal 0103 physical sciences Thermal stability Powder diffraction |
| Zdroj: | Propellants, Explosives, Pyrotechnics. 41:1006-1012 |
| ISSN: | 0721-3115 |
| Popis: | Stuctural transformations of 1,1-diamino-2,2-dinitroethene (FOX-7) were investigated in the temperature range 298–513 K by means of DSC, TG, isothermal calorimetry, PXRD, IR spectroscopy, and electron microscopy. The data obtained confirm the existence of the high-temperature δ-FOX-7 polymorph stable above 480 K. The heat effect of the γ→δ transformation is − 4.6 J g−1 (−680 J mol−1). Metastable γ-phase formed in the reverse process δ→γ has a perfect crystal structure and is stable towards thermal decomposition. Possible mechanisms of sharp deceleration of thermal decomposition of FOX-7 at the 40 % conversion are discussed. |
| Databáze: | OpenAIRE |
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