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. 2015 Sep 1;5:13582. doi: 10.1038/srep13582

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Copyright © 2015, Macmillan Publishers Limited

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Red bars represent positions and intensities of Bragg reflections of the Rietveld refined I4/mcm MgO₂. Dark blues bars correspond to MgO. The peak marked with an asterisk belongs to oxygen. Inset: Rietveld refinement of the MgO₂ crystal structure. Grey bars approximate positions of the strongest ζ-O₂ peaks. Green curve represents the calculated intensities of the refined structure (I_calc). Black line is the intensity difference curve (I_obs − I_calc). Calculated residuals after background subtraction are R_exp = 0.138, R_wp = 0.265. The x-ray wavelength is 0.3344 Å.