Magnetite electron micrograph

The above recipe is not directly indicated in [1292], which reports six different recipes for magnetites. Electron micrographs of three powders and specific surface areas of two powders are reported. IEP (data points not reported) was given without specification of method. 

Figure 1.4. (a) Scanning electron micrograph of a fractured cross section of a mineralized tooth from the radula in Fig. 1.1. (b) Enlargement of the upper part of the same fractured cross section. The magnetite layer (M) lines the interior surface. The thick dahllite layer (D) is on the exterior. The thin lepidocrocite layer (L) is sandwiched between the two. C, organic sheath and cell remnants. 

Magnetite nanorods have been prepared by the sonication of aqueous iron (II) acetate in the presence of yS-cyclodextrin [77]. The as-prepared magnetite nanorods are ferromagnetic and their magnetization at room temperature is about 78 emu g k The particle sizes measured from transmission electron micrographs are about 48/14 nm (L/W). A mechanism for the sonochemical formation of magnetite nanorods is discussed. 

FIG U RE 17.3 Transmission electron micrograph (TEM) for magnetite polystyrene particles. (From Ramirez, L.P. and Landfester, K., Macromol. Chem. Phys., 204, 22, 2003.)... 

Fig. 6 Vanadium substitution in bionanomagnetite, a) Transmission electron micrographs of 10% vanadium doped magnetite b) Fe 1.2,3 XAS and corresponding XMCD spectra for biomagnetite (solid line (red)) and 10% vanadium-doped magnetite (dashed) c) calculated V La edge XAS for V(III) (dots (red)) and V(IV) (long dashes(blue)), and V(III) - - V(IV) summed in a 1 1 ratio (solid line (green)) compared with the experimental XAS (dashes(black)) d) calculated XMCD for V(III) (solid line (red)) compared with experiment (dashed (black)). The V spectra were calculated for octahedral crystal field of 10Z) =1.8 eV in the absence of 3d spin-orbit interaction.

X-ray diflEraction (XRD) analysis has been a useful tool to check the presence of minerals (viz., Mullite, Hematite, Magnetite and ot-Quartz) as the main crystalline phase in the fly ash and its zeolites, in addition to the presence of amorphous glassy phase [16, 38]. Furthermore, micrographs obtained by scanning electron microscopy (SEM) of the fly ash and its zeohtes, as depicted in Fig. 2.6a, have been found to be a useful tool for demonstrating the shape and grain size of constituent minerals (refer Table 2.5 [8, 24]). 

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