Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.095502
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Funding
- U.S. Department of Energy by Lawrence Livermore National Laboratory [W-7405-Eng-48]
- [DE-AC52-07NA27344]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [805056] Funding Source: National Science Foundation
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Raman spectra of solid and fluid nitrogen to pressures up to 120 GPa and temperatures up to 2500 K reveal that the melting line exhibits a maximum near 70 GPa, followed by a triple point near 87 GPa, after which the melting temperature rises again. Fluid nitrogen remains molecular over the entire pressure range studied, and there is no sign of a fluid-fluid transition. Solid phases obtained on quenching from the melt above 48 GPa are identical to the recently discovered iota and xi' phases. We find that kinetics plays a major role in the experimentally observed phase changes and account for the metastability of various crystalline molecular phases and the existence of an amorphous single bonded eta - N.
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