HRTEM magnetite

Boron nitride capsules containing 10-20 nm particles of magnetite were produced by forming pellets of boron nitride magnetite in a ratio of 8 2 and arc melting the pellets in an Ar/N2 atmosphere for a few minutes. HRTEM confirmed that the magnetite particles were encapsulated in the boron nitride (Hirano et al., 1999). 

Fig. 6. HRTEM lattice image of a bacterial magnetite ciystal from coccoid cells. The crystal is imaged along the [110] direction and has a characteristic rectangular shape when viewed in projection. Truncated faces are identified. Lattice fringes are 111, 4.85 A and 200, 4.2 A. Bar = 20 nm.

NPs and TEM of magnetite, (b) TEM image, high-resolution transmission electron microscopy (HRTEM) image and electron diffraction pattern of monodisperse MnO nanocrystals (From Ref. 21a, Nat. Mater., 3 (2004) 891. 2011 Nature Publishing Group). 

Fig. 5.11 High resolution transnussion electron microscopy (HRTEM) images of (a) magnetite NP encapsulated in silica (b) magnetite NPs embedded in a zeolitic (aluminosilicate) matrix (c) Fe NPs encapsulated in silica (energyfiltering TEM, EFTEM, color map) (d) magnetite NP encapsulated in graphite (Reprinted with permission from Arruebo et al. [228]. Copyright 2009 Elsevier)...

Figure 3.30 HRTEM of a wear particle, (a) Maghemite nanoparticle observed under a [1, —1, 0] azimuth. Distances measured on the calculated diffractogram d = 4.85 nm ) are in good agreement with the theoretical magnetite structure observed under a [1, -1, 0] azimuth, (b) Intact carbon onions are observed...

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