Figure 1: Structure of ordered and disordered Na2RuO3.
From: Intermediate honeycomb ordering to trigger oxygen redox chemistry in layered battery electrode
Oxide ions (red) stack in the manner of ABCABC while both Na (yellow) and Ru (grey) occupy octahedral sites for both Na2RuO3. Ordered Na2RuO3 has the honeycomb-type cation ordering in the [Na1/3Ru2/3]O2 slab. Disordered Na2RuO3 has the randomly distributed [Na1/3Ru2/3]O2 slab.
