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Fig. 7 | Geochemical Transactions

Fig. 7

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

Fig. 7

The four different types of crystals observed in MndBi3_10y. Examples of TEM observations made on the four different types of crystals observed in sample MndBi3_10y. Crystal type 1 had a xerogel-like configuration and typical crystal size of 5–20 nm (a), crystal type 2 had needle-like shape and an extension of 10–30 nm (b), crystal type 3 had lath-like shape and typical size of about 20–150 nm (c), and crystal type 4 was built of type 3 crystals with rotation of n × 120° (n = 1 or 2) between adjacent layers (d)

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Geochemical Transactions

ISSN: 1467-4866

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