Raman spectroscopy and melting of nitrogen between 290 and 900 K and 2.3 and 18 GPa

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Abstract
Raman spectroscopy was used to study the melting of nitrogen from 290 to 900 K at pressures from 2.3 to 18 GPa. This work, which extends the melting by a factor of 9 over previously published results was made possible by new developments in high‐temperature diamond‐anvil cells. The β/δ phase boundary was also determined, and the β–δ–fluid triple point was found to be at 578±10 K and 9.9±0.5 GPa. The Raman frequencies of the vibron in fluid N2 and the ν2 vibron in δ‐N2 were found to have the same pressure dependence and be independent of temperature to a good approximation. A temperature‐independent pressure scale, useful to at least 900 K is approximated by P/GPa=0.4242 ν/cm− 1 −987.8, where ν is the frequency of either the ν2 vibron in δ‐N2 or the vibron in fluid‐N2.

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