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. 2025 Jun 6;8:177. doi: 10.1038/s42004-025-01566-3

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© The Author(s) 2025

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Fig. 4 — a ELF contour map showing the (0 0 1/2) plane. b ELF isosurface with the value of 0.9, shown within the I4/m unit cell. Na atoms are represented by white spheres. The Wyckoff sites corresponding to octahedral interstitial voids are marked by different colors: 2b (red), 4e (black), 8h (green) and 16i (cyan). These sites are in close proximity to the centers of ELF lobes.