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Fig. 8 | Geochemical Transactions

Fig. 8

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

Fig. 8

TEM observation of MndBi3_10y and SAED patterns of type 1 and type 4 crystals. Top panel Low-magnification view of crystals from MndBi3_10y. Circles indicate areas which were subjected to electron diffraction. Circle at the top left (SAED 1) targeted crystal type 4, which had a diffraction pattern exhibiting features characteristics for cryptomelane, and in particular d-spacing of 2.40, 2.19, 1.80, 1.54 and 1.42 Å (pattern at the bottom left). Circle at the bottom right (SAED 2) targeted crystal type 1 and had a signal typical for δ-MnO2, with distances of 2.42 and 1.40 Å (pattern at the bottom right). Crystals types 2 and 3 which are most easily distinguishable are pointed out with arrows

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Geochemical Transactions

ISSN: 1467-4866

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