1. The $\epsilon$-$\zeta$ Transition in Solid Oxygen
- Author
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Elatresh, Sabri F., Askarpour, V., and Bonev, S. A.
- Subjects
Condensed Matter - Materials Science - Abstract
The structure of solid oxygen has been studied at pressures from 50 to 140~GPa using static structure search methods and molecular dynamics simulations with density functional theory and a hybrid exchange functional. Several crystalline structures with space group symmetries {\it Pnma}, {\it P}\,2$_{1}${\it /m}, {\it Pm} and {\it P}\,6$_3$/{\it mmc} have been identified as candidates for the $\zeta$ phase of oxygen at 0~K. Within the hybrid exchange functional framework and at 300~K temperature, {\it Pm} is shown to be energetically most favorable above 111~GPa. A comparison with experimental X-ray diffraction, spectroscopic and superconductivity measurements is provided for all competing structures., Comment: 6 pages, 5 figures
- Published
- 2023