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Fig. 9 | Geochemical Transactions

Fig. 9

From: Cryptomelane formation from nanocrystalline vernadite precursor: a high energy X-ray scattering and transmission electron microscopy perspective on reaction mechanisms

Fig. 9

TEM observations of two different type 3 crystals from MndBi3_10y. a Shows the presence of a dislocation perpendicular to c*, highlighted with arrows in c which corresponds to the area delimited with a dotted line in a. b Shows evidence for the disruption of lattice fringes perpendicular to ab and thus certainly witnesses aggregation of two crystals, as highlighted with a dotted line in d which is a magnified view of the area delimited with a dotted line in b. In both crystals presented here, lattice fringes separated by 6.9 and 9.5 Å could be observed, close to the values expected for the layer-to-layer distances in δ-MnO2 having respectively one and two planes of interlayer water molecules

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