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. 2025 Jan 2;16:334. doi: 10.1038/s41467-024-55630-y

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© The Author(s) 2025

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

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Fig. 1 — a Schematic illustration of the synthesis of Fe₂-N₆. b TEM, (c) HAADF-STEM, and (d) EDS elemental mapping images of Fe₂-N₆. e Aberration-corrected HAADF-STEM image of Fe₂-N₆. f Magnified HAADF-STEM image of Fe₂-N₆ and (g) the corresponding 3D atom-overlapping Gaussian-function fitting maps of the region in panel f. h Distance distribution between neighboring Fe atoms. The inset images in panel h show the HAADF-STEM image and the proposed model of a typical pair of neighboring Fe atoms. i Crystal structure of Fe₃O₄.