Sodium chloride phases with unconventional non-1:1 stoichiometries are known to exist under high-pressure conditions. Now, Na2Cl and Na3Cl two-dimensional crystals have been obtained under ambient conditions, on graphene surfaces, from dilute solutions.
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Oganov, A.R. 2D materials worth their salt. Nature Chem 10, 694–695 (2018). https://doi.org/10.1038/s41557-018-0096-6
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DOI: https://doi.org/10.1038/s41557-018-0096-6
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