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. 2024 Jul 3;31(32):45162–45176. doi: 10.1007/s11356-024-34120-0

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© The Author(s) 2024

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Fig. 4 — TEM analysis of NS_Fe showing a composition of serpentine polymorphs and magnetite: a chrysotile fibers with 13.5% Fe; b electron diffraction pattern of polycrystalline area in a; c modulated antigorite with 3.84% Fe; d selected area electron diffraction (SAED) of the spot highlighted in c; e magnetite, Fe₃O₄ (76% Fe, close to stoichiometric 72%); f 3D electron diffraction of the cubic face-centered cell of magnetite, with a = 8.4 Å