Extended Data Fig. 1 | Further structural characterization of pristine
materials. a, b, Neutron powder diffraction data for (a) Na0.75[Li0.25Mn0.75]O 2
and (b) Na0.6[Li0.2Mn0.8]O 2 refined using the P 63 /mmc space group, which
excludes superstructure ordering. Rietveld refinement was performed with
GSAS II software. Refinement parameters are given in the tables in the lower
part of the figure, including the goodness of fit (G.O.F). Inductively coupled
plasma (ICP) optical emission spectroscopy was used to confirm the chemical
compositions.