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Crystal structure of solid Oxygen at high pressure and low temperature | | Federico A. Gorelli
; Mario Santoro
; Lorenzo Ulivi
; Michael Hanfland
; | | Date: |
21 Nov 2001 | | Subject: | Materials Science | cond-mat.mtrl-sci | | Affiliation: | LENS, and INFM, Firenze, Italy), Mario Santoro (LENS, and INFM, Firenze, Italy), Lorenzo Ulivi (IEQ-CNR, LENS, and INFM, Firenze, Italy) and Michael Hanfland (ESRF, Grenoble, France | | Abstract: | 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. | | Source: | arXiv, cond-mat/0111412 | | Services: | Forum | Review | PDF | Favorites | |
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