Crystallite, single, layer

FIGURE 39.2 Schematic presentation of poorly crystalline carbon, (a) Single-layer plane, (b) parallel layers in a crystallite, (c) unassociated carbon, (d) an aggregate of crystallites, single layers and unassociated carbon. (From Bokros, J.C. 1972. Chem. Phys. Carbon. 5 70-81, New York, Marcel Dekker. With permission.)... 

It was also reported that microcrystallites of layered semiconductor Pblj were prepared in colloidal form. The spectrum of such a colloidal solution consisted of three absorption bands in the UV which were considerably bu hifted from the absorption threshold of macrocrystalline Pblj. These results were explained by carrier confinement in three differently sized crystallites, each a single layer ( 7 A) thick. However, complexes of Pbl2 with iodide have similar absorption bands, and it seems at the present time that additional experiments have to be carried out to ascertain the colloidal nature of the absorbing species. Size quantization was also reported for colloids of red Hgl2 in acetonitrile... 

Fig. 11. Single layers of MoS on pyrrhotite crystallite (49). Pyrrhotite lattice lines are 5.8. A apart.

Fig. 11.1 Schematic illustration of a single-layer hexagonal crystallite of MCM-22 showing surface pockets...

What is the thickness of these oxide films which produce ct values as high as lO Q-cm - The be.st estimate seems possible for the even and integral layer of crystallites on A, seen in Fig. 16c. Assuming that only a single layer of these is present, the layer thickness would then be ca. 30 nm. 

Figure 18.14 The diffraction pattern of helices in fiber crystallites can be simulated by the diffraction pattern of a single slit with the shape of a sine curve (representing the projection of a helix). Two such simulations are given in (a) and (b), with the helix shown to the left of its diffraction pattern. The spacing between the layer lines is inversely related to the helix pitch, P and the angle of the cross arms in the diffraction pattern is related to the angle of climb of the helix, 6. The helix in (b) has a smaller pitch and angle of climb than the helix in (a). (Courtesy of W. Fuller.)...

Electrodeposition of copper indium disulfide (CulnS2) has been reported [180-182], In a typical instance, single-phase polycrystalline CuInS2 thin films composed of 1-3 fim sized crystallites were grown on Ti by sulfurization of Cu-ln precursors prepared by sequentially electrodeposited Cu and In layers [183]. In this work, solar cells were fabricated by electrodepositing ZnSe on CuInS2. Cyclic... 

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