Crystal structure of solid Oxygen at high pressure and low temperature

Details Crystal structure of solid Oxygen at high pressure and low temperature Crystal structure of solid Oxygen at high pressure and low temperature

2001-11-21

arxiv.org/abs/cond-mat/0111412v1

Physics

Condensed Matter

Materials Science

4 pages with three figures

Scientific paper

10.1103/PhysRevB.65.172106

Results of X-ray diffraction experiments on solid oxygen at low temperature and at pressures up to 10 GPa are presented.A careful sample preparation and annealing around 240 K allowed to obtain very good diffraction patterns in the orthorhombic delta-phase. This phase is stable at low temperature, in contrast to some recent data [Y. Akahama et al., Phys. Rev. B64, 054105 (2001)], and transforms with decreasing pressure into a monoclinic phase, which is identified as the low pressure alpha-phase. The discontinuous change of the lattice parameters, and the observed metastability of the alpha-phase increasing pressure suggest that the transition is of the first order.

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