Solid-Solid Phase Transition Kinetics of FOX-7

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Since it was developed in the late 1990s, 1,1-diamino-2,2-dinitroethene (FOX-7), with lower sensitivity and comparable performance to RDX, has received increasing interest. This paper will present our results for the phase changes of FOX-7 using DSC and HFC (Heat Flow Calorimetry). DSC thermal curves recorded at linear heating rates of 0.10, 0.35 and 1.0 C min{sup -1} show two endothermic peaks and two exothermic peaks. The two endothermic peaks represent solid-solid phase transitions, which have been observed in the literature at 114 C ({beta}-{gamma}) and 159 C ({gamma}-{delta}) by both DSC and XPD (X-ray powder diffraction) measurements. The first transition ... continued below

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Burnham, A K; Weese, R K; Wang, R; Kwok, Q M & Jones, D G July 12, 2005.

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Since it was developed in the late 1990s, 1,1-diamino-2,2-dinitroethene (FOX-7), with lower sensitivity and comparable performance to RDX, has received increasing interest. This paper will present our results for the phase changes of FOX-7 using DSC and HFC (Heat Flow Calorimetry). DSC thermal curves recorded at linear heating rates of 0.10, 0.35 and 1.0 C min{sup -1} show two endothermic peaks and two exothermic peaks. The two endothermic peaks represent solid-solid phase transitions, which have been observed in the literature at 114 C ({beta}-{gamma}) and 159 C ({gamma}-{delta}) by both DSC and XPD (X-ray powder diffraction) measurements. The first transition shifts from 114.5 to 115.8 C as the heating rate increases from 0.10 to 1.0 C min{sup -1}, while the second transition shifts from 158.5 to 160.4 C. Cyclical heating experiments show the endotherms and exotherms for a first heating through the {gamma} phase to the {delta} phase, a cooling and reversion to the {alpha} or {beta} phase, and a second heating to the {gamma} and {delta} phases. The data are interpreted using kinetic models with thermodynamic constraints.

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PDF-file: 10 pages; size: 0.3 Mbytes

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  • Presented at: 2005 NATAS Annual Conference, Universal City, CA, United States, Sep 18 - Sep 21, 2005

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  • Report No.: UCRL-CONF-213671
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 881644
  • Archival Resource Key: ark:/67531/metadc886429

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 12, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 1, 2016, 10:47 p.m.

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Burnham, A K; Weese, R K; Wang, R; Kwok, Q M & Jones, D G. Solid-Solid Phase Transition Kinetics of FOX-7, article, July 12, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc886429/: accessed October 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.