High pressure–temperature phase diagram of 1,1-diamino-2,2-dinitroethylene (FOX-7) [electronic resource].
- Published
- Washington, D.C. : United States. National Nuclear Security Administration, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy - Physical Description
- pages 9,739-9,747 : digital, PDF file
- Additional Creators
- Los Alamos National Laboratory, United States. National Nuclear Security Administration, and United States. Department of Energy. Office of Scientific and Technical Information
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- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- In this study, the pressure–temperature (P–T) phase diagram of 1,1-diamino-2,2-dinitroethylene (FOX-7) was determined by in situ synchrotron infrared radiation spectroscopy with the resistively heated diamond anvil cell (DAC) technique. The stability of high-P–T FOX-7 polymorphs is established from ambient pressure up to 10 GPa and temperatures until decomposition. The phase diagram indicates two near isobaric phase boundaries at ~2 GPa (α → I) and ~5 GPa (I → II) that persists from 25 °C until the onset of decomposition at ~300 °C. In addition, the ambient pressure, high-temperature α → β phase transition (~111 °C) lies along a steep boundary (~100 °C/GPa) with a α–β–δ triple point at ~1 GPa and 300 °C. A 0.9 GPa isobaric temperature ramping measurement indicates a limited stability range for the γ-phase between 0.5 and 0.9 GPa and 180 and 260 °C, terminating in a β–γ–δ triple point. With increasing pressure, the δ-phase exhibited a small negative dT/dP slope (up to ~0.2 GPa) before turning over to a positive 70 °C/GPa slope, at higher pressures. The decomposition boundary (~55 °C/GPa) was identified through the emergence of spectroscopic signatures of the characteristic decomposition products as well as trapped inclusions within the solid KBr pressure media.
- Report Numbers
- E 1.99:la-ur--15-26331
la-ur--15-26331 - Subject(s)
- Other Subject(s)
- Note
- Published through SciTech Connect.
08/27/2015.
"la-ur--15-26331"
Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory 119 37 ISSN 1089-5639 AM
Matthew M. Bishop; Nenad Velisavljevic; Raja Chellappa; Yogesh K. Vohra. - Funding Information
- AC52-06NA25396
NA0002014
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