Figure 1.

(a) Schematic of the NaNb₁₃O₃₃ crystal structure highlighting the (5×3–2)_∞ blocks of NbO₆ octahedra and each unique Nb site. (b) Neutron powder diffraction of 1-NNO obtained at 300 K, λ_c = 1.5 Å. (c) Synchrotron X-ray powder diffraction of 1-NNO at 300 K, λ_c = 0.45788 Å. The diffuse background feature is due to the Kapton capillary sample holder. The inset shows an SEM image of pristine 1-NNO particles