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Remarkable stability of - and its prevalence in the nitrogen phase diagram
Jinwei Yan1,2,3,4, Philip Dalladay-Simpson5, Lewis J Conway6,7
1Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China.
Scientific Reports
|July 16, 2024
Summary
The pressure-temperature path significantly influences solid nitrogen
Area of Science:
- Condensed matter physics
- Materials science
- High-pressure physics
Background:
- Solid nitrogen displays complex phases and metastability.
- Phase stability is often dependent on specific pressure-temperature (P-T) pathways.
Purpose of the Study:
- To investigate the influence of P-T pathways on the nitrogen phase diagram.
- To identify path-dependent phenomena and triple points in solid nitrogen.
Main Methods:
- Combination of Raman spectroscopy and dynamic compression techniques.
- Exploration of various pressure-temperature pathways below 2 GPa.
Main Results:
- A path- and phase-dependent triple point was discovered.
- Specific P-T pathways below the triple point lead to the formation of the - phase.
- Pathways above the triple point yield the - phase and the established phase diagram.
- Rapid compression bypasses certain modifications, forming - at higher temperatures.
Conclusions:
- The nitrogen phase diagram is critically dependent on the P-T pathway taken.
- Compression rate influences phase formation, challenging current understanding of dense molecular solids.
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