Figure 2: Structural characterization of disordered and ordered Na2RuO3.
From: Intermediate honeycomb ordering to trigger oxygen redox chemistry in layered battery electrode
Observed and calculated (Rietveld method) synchrotron X-ray diffraction patterns for (a) disordered and (b) ordered Na2RuO3. Red crosses: experimental, black line: calculated, blue line: difference and green bars: Bragg positions. The black arrows in b indicate the superstructure peaks that were not considered for the refinement. Insets of a,b correspond to the 99Ru Mössbauer spectra recorded at 4.2 K for both pristine materials. Vertical error bars represent 1σ s.d. of counting statistics. Selected area electron diffraction (SAED) patterns in the (c) [001]hex zone axes of disordered Na2RuO3, and in the (d) [001]hex and (e) [110]hex zone axes of ordered Na2RuO3. The red circles and arrows, respectively, indicate the central and fundamental diffraction spots, which are common to disordered Na2RuO3. Un-marked diffraction spots in between correspond to superstructure peaks. Scale bars, 10 nm−1.
