Copolymerization of CO and N2 to Extended CON2 Framework Solid at High Pressures
Synthesis of novel extended forms of nitrogen and nitrogen-rich materials has been a topic of interest in development of high-energy-density materials. Here, we present the formation of high-density (3.983 g/cm3) copolymer CON2, formed in crystalline form by laser heating of CO–N2 mixtures above 1700 K and 45 GPa—a substantially lower pressure–temperature condition than those required for converting pure nitrogen (above 110 GPa and 2000 K). It can be made even at lower pressures ~20 GPa at ambient temperature for amorphous solid. According to the refined structure, the crystalline polymer is made of nitrogen-hybridized, eight-membered rings of singly bonded CON2 in a three-dimensional framework structure in the space group of P43, as one of the previously predicted structures. Furthermore, unlike the predicted structures, the present P43 solid converts back to ε-N2-like and δ-N2-like molecular phases as pressure unloads to 20 and 10 GPa, respectively.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); NSF-DMR; ARO; Defense Advanced Research Projects Agency (DARPA)
- Grant/Contract Number:
- NA0001974; NA0003342; 1701360; W911NF-17-1-0468; W31P4Q-12-1-0009
- OSTI ID:
- 1463722
- Journal Information:
- Journal of Physical Chemistry. C, Vol. 122, Issue 24; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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