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Evidence for a High-Pressure Isostructural Transition in Nitrogen.
- Source :
- Chinese Physics Letters; Feb2022, Vol. 39 Issue 2, p1-13, 13p
- Publication Year :
- 2022
-
Abstract
- We observed an isostructural phase transition in the solid nitrogen λ -N<subscript>2</subscript> at approximately 50 GPa accompanied by anomalies in lattice parameters, atomic volume and Raman vibron modes. The anomalies are ascribed to a slight reorientation of the nitrogen molecules, which does not seem to affect the monoclinic symmetry (space group P 2<subscript>1</subscript>/ c). Our ab initio calculations further confirm the phenomena, and suggest an optimized structure for the λ -N<subscript>2</subscript> phase. In addition, a new high-pressure amorphous phase of η ′-N<subscript>2</subscript> was also discovered by a detailed investigation of the pressure-temperature phase diagram of nitrogen with the aim of probing the phase stability of λ -N<subscript>2</subscript>. Our result may provide helpful information about the crystallographic nature of dissociation transitions in diatomic molecular crystals (H<subscript>2</subscript>, O<subscript>2</subscript>, N<subscript>2</subscript>, etc). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0256307X
- Volume :
- 39
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Chinese Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 155120543
- Full Text :
- https://doi.org/10.1088/0256-307X/39/2/026401