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Title: Phase diagram of N/sub 2/ determined by Raman spectroscopy from 15 to 300 K at pressures to 52 GPa

Abstract

Diamond-anvil cells were used to study the Raman scattering of solid nitrogen from 15 to 300 K at pressures up to 52 GPa. By associating characteristic features in the vibration and phonon spectra of N/sub 2/ with each of the known ..beta.., ..gamma.., and delta crystal forms over regions where the structures have been determined by X-ray diffraction, it was possible to extend the phase diagram through optical measurements alone. The delta-N/sub 2/ phase exists above a few gigapascals at all experimental temperatures. Over wide regions of this phase, however, the solid appears to distort from its earlier assigned space group Pm3n. It is not clear whether the distortion is continuous or whether various discrete low-symmetry structures are formed.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM
OSTI Identifier:
6635689
Resource Type:
Journal Article
Journal Name:
J. Phys. Chem.; (United States)
Additional Journal Information:
Journal Volume: 88:12
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 08 HYDROGEN; NITROGEN; PHASE DIAGRAMS; EXPERIMENTAL DATA; LOW TEMPERATURE; MEDIUM TEMPERATURE; PHONONS; RAMAN EFFECT; SPECTRA; VERY LOW TEMPERATURE; VIBRATIONAL STATES; DATA; DIAGRAMS; ELEMENTS; ENERGY LEVELS; EXCITED STATES; INFORMATION; NONMETALS; NUMERICAL DATA; QUASI PARTICLES; 400201* - Chemical & Physicochemical Properties; 080800 - Hydrogen- Properties & Composition

Citation Formats

Buchsbaum, S, Mills, R L, and Schiferl, D. Phase diagram of N/sub 2/ determined by Raman spectroscopy from 15 to 300 K at pressures to 52 GPa. United States: N. p., 1984. Web. doi:10.1021/j150656a018.
Buchsbaum, S, Mills, R L, & Schiferl, D. Phase diagram of N/sub 2/ determined by Raman spectroscopy from 15 to 300 K at pressures to 52 GPa. United States. https://doi.org/10.1021/j150656a018
Buchsbaum, S, Mills, R L, and Schiferl, D. Thu . "Phase diagram of N/sub 2/ determined by Raman spectroscopy from 15 to 300 K at pressures to 52 GPa". United States. https://doi.org/10.1021/j150656a018.
@article{osti_6635689,
title = {Phase diagram of N/sub 2/ determined by Raman spectroscopy from 15 to 300 K at pressures to 52 GPa},
author = {Buchsbaum, S and Mills, R L and Schiferl, D},
abstractNote = {Diamond-anvil cells were used to study the Raman scattering of solid nitrogen from 15 to 300 K at pressures up to 52 GPa. By associating characteristic features in the vibration and phonon spectra of N/sub 2/ with each of the known ..beta.., ..gamma.., and delta crystal forms over regions where the structures have been determined by X-ray diffraction, it was possible to extend the phase diagram through optical measurements alone. The delta-N/sub 2/ phase exists above a few gigapascals at all experimental temperatures. Over wide regions of this phase, however, the solid appears to distort from its earlier assigned space group Pm3n. It is not clear whether the distortion is continuous or whether various discrete low-symmetry structures are formed.},
doi = {10.1021/j150656a018},
url = {https://www.osti.gov/biblio/6635689}, journal = {J. Phys. Chem.; (United States)},
number = ,
volume = 88:12,
place = {United States},
year = {1984},
month = {6}
}