ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.453310
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