Terrace-like structure

Most of the R2Ni2Pb plumbides have been grown in the form of single crystal platelets either via a lead flux or by special annealing procedures (Chinchure et al., 2003). The surfaces of such crystals show terrace-like structures. The single crystals then allow direction dependent magnetic measurements. 

Fig. 4.19 Phase behavior of P(F)S49-b-PLA192 (, on silanized ITO-coated glass, a Cross-section revealing that the top part of the film formed cylinders orientated perpendicular to the substrate which were voided during PLA etch. In contrast, cylinders aligned parallel to the substrate were adopted at the bottom part of the film which were not voided because of lacking etchant infiltration. Compared to Fig. 4.15 this highlights the advantages of a multicontinuous structure like the DG. b Top-view onto lying cylinders forming a terrace-like structure...

Keller has shown that a terrace-like structure is observed reflecting the stacking of the lamellae structure in a melt-grown crystal (Figure 5.6). 

Figure 5.8 Non-contact AFM images of DCNDBQT evaporated on Ti02 with a CNBTPA template layer (a) 5 pm overview of the prepared sample, (b) zoomed image (terraces and the hill like structures), (c) high resolution image with a DCNDBQT unit cell of a = 2.0 nm, b = 0.7 nm, c = 1.5 nm.

Fig. 9. STM image revealing the faceting transition between (110) terraces and a (nlO) like structure as the potential is swept between A.) -0.395 V and B.) -0.194 V. (74 nm x 74 nm)...

The addition of a second oxide to the titania surface produces new nucleation sites for Au and improves the dispersion of the admetal. " In the CeO /TiOgCllO) systems, the Ce cations adopt a structural geometry (Fig. 6.2A) and an oxidation state (-1-3) which are quite different from those seen in bulk ceria or for ceria nanoparticles deposited on metal substrates. On TiO2(110), one has CegOg dimers that join forming wire-like structures on the terraces of the titania substrate. ... 

Figure 24. Schematic illustrations of the conditions of surface lattice structure (a) amorphous-like surface with no identity of orientation, (b) surface with kinks, steps and terraces characteristic of certain crystalline orientation and (c) surface with no identity of the lattice structure of the crystal due to the coverage of an amorphous oxide film. 

Now, just where the ion is most likely to land is a question.92 There is much structure on the metal surface, but the largest open area for a landing field consists of the terraces between steps, as shown in Fig. 7.137. When an ion lands upon a terrace, it at first appears to diffuse aimlessly, but there gradually develops a net movement... 

The investigation of anodic oxide on various metals shows that at first usually amorphous structures are formed with a dense coverage of the terraces with grains, which change to nano-crystallites with time. The extent and the rate of this change depend on the system under study. This crystallization occurs for Cr within hours [127], whereas Cu keeps the amorphous grain structure for a very few minutes only and develops a well-ordered, faceted, crystalline layer covering the whole electrode surface [128, 129], In the next section, the details of the structure of layers formed on Cu are discussed, followed by a summary of some other more reactive metals like Ni and Cr. 

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