Polymerization, shock cooling and ionization of liquid nitrogen
The trajectory of thermodynamic states passed through by the nitrogen Hugoniot starting from the liquid and up to 10{sup 6} GPa has been studied. An earlier report of cooling in the doubly shocked liquid, near 50 to 100 GPa and 7500 K, is revisited in light of the recent discovery of solid polymeric nitrogen. It is found that cooling occurs when the doubly shocked liquid is driven into a volume near the molecular to polymer transition and raising the possibility of a liquid-liquid phase transition (LLPT). By increasing the shock pressure and temperature by an order of magnitude, theoretical calculations predict thermal ionization of the L shell drives the compression maxima to 5-6 fold compression at 10 Mbar (T {approx} 3.5 10{sup 5} K) and at 400 Mbar (T {approx} 2.3 10{sup 6} K) from K shell ionization. Near a pressure of 10{sup 6} GPa the K shell ionizes completely and the Hugoniot approaches the classical ideal gas compression fourfold limit.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 936438
- Report Number(s):
- UCRL-JRNL-213966; TRN: US0805514
- Journal Information:
- Physical Review B, vol. 74, N/A, July 11, 2006, pp. 024103, Vol. 74
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dynamic Compression of Hydrogen and Other Small Molecular Fluids at High Pressures
Shock-Compressed Diamond: Melt, Insulator-Conductor and Polymeric-Atomic Transitions