Figure 5
The valence of Na in Na1.58CuO2. (a) Refined modulation functions; (b) modulation functions from Na1.6CuO2. Valences have been computed by the bond-valence method with the parameter R0[Na—O] = 1.800 Å (Brese & O'Keeffe, 1991). Full and dashed lines apply to modulated and basic structures, respectively. |