Phase transitions in nitrogen observed by Raman spectroscopy from 0. 4 to 27. 4 GPa at 15 K

Journal Article · Thu May 23 00:00:00 EDT 1985 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100257a036· OSTI ID:5032100

Schiferl, D; Buchsbaum, S; Mills, R L

Raman scattering from solid nitrogen was measured in a diamond-anvil cell from 0.4 to 27.4 GPa at a temperature of 15 K. Two new low-temperature structures, delta(LT1)-N/sub 2/ and delta(LT2)-N/sub 2/, were discovered through changes in the Raman spectra. Both structures bear a resemblance to the known high-temperature delta-N/sub 2/ phase, which has space group Pm3n. From a comprehensive study of correlation diagrams for related structures, likely space groups for the new phases were found. delta(LT1)-N/sub 2/, which forms from ..gamma..-N/sub 2/ at 1.9 GPa and is stable up to about 21.0-24.5 GPa, probably has structure R3c, in agreement with recent theoretical calculations. At higher pressures, delta(LT2)-N/sub 2/ exhibits a structure that is quite possibly R3c. 26 references, 4 figures, 7 tables.

• Research Organization: Los Alamos National Lab., NM
• OSTI ID: 5032100
• Journal Information: J. Phys. Chem.; (United States), Vol. 89:11
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NITROGEN
CRYSTAL STRUCTURE
RAMAN SPECTROSCOPY
CRYSTAL LATTICES
EXPERIMENTAL DATA
LATTICE VIBRATIONS
PRESSURE DEPENDENCE
RAMAN SPECTRA
SPACE GROUPS
TEMPERATURE DEPENDENCE
VERY HIGH PRESSURE
VERY LOW TEMPERATURE
VIBRATIONAL STATES
DATA
ELEMENTS
ENERGY LEVELS
EXCITED STATES
INFORMATION
LASER SPECTROSCOPY
NONMETALS
NUMERICAL DATA
SPECTRA
SPECTROSCOPY
360602* - Other Materials- Structure & Phase Studies