High-resolution lattice imaging

High-resolution lattice images (e.g., Fig. 8(c)) reveal that the platelets are associated neither with dislocation loops nor with either intrinsic or extrinsic stacking faults. The platelets appear to be microcracks in which the separation between adjacent planes of Si atoms over a finite area is increased due to the slight displacement of these atoms from their substitutional lattice sites. From computer simulations, the lattice images are... 

Fig. 11.2 (a) HAADF-STEM image of a stained cell section (40nm thick). A SWNT cluster within a lysosome invading the lysosomal cell membrane, (b) Corresponding high-resolution lattice image of SWNTs at the lysosomal membrane from boxed area. Cytoplasm (cy) and secondary... 

Figure 16 (a) High density of intergrowths with various perovskite slab widths (arrowed), with the SADP (inset), (b) High resolution lattice image from FEG STEM showing layers with different perovskite slabs A and B. (c) and (d) EDX nanometer analysis from A and B, showing increased Cu content in A with more Cu-O layers. 

Fig. 2.78 Lattice image of an intergrowth structure [(3, 2 ), (3, 2 ) ] in clinohumite (3, 2 )ccp On the right (b) is shown the high-resolution lattice image of clinohumite, in the top left (a) the diffraction pattern and in the bottom left (a) the lattice image at low magnification. An ordered intergrowth of (3, 2 ) in every four clinohumite (3, 2 ) is seen, i.e. [(3, 2 ), (3,2 ) ].

The proposed structure for ECR-1 was solved by accumulating evidence from many "traditional" sources, such as the synthesis phase relationships, powder x-ray diffraction (PXD) and electron diffraction (ED), molecular probe sorption, infra-red analysis (IR) and electron microscopy (EM). Initial unsuccessful models were based on extended merlinoite frameworks, followed by modifications based on mordenite. The observation of crystal overgrowths of mazzite in high resolution lattice images was the key to recognizing the compatibility of mordenite and mazzite structural layers, and that intimate intergrowth of the two structures was possible. 

To produce a high-resolution lattice image of a crystal, at least two beams must be allowed to pass through the aperture in the back focal plane of the objective lens. The basic optical principles involved in this imaging mode are discussed in Chapter 1. However, a number of factors not discussed there influence high-resolution TEM images these are the main concern of Chapter 6. 

Stacking faults are a-boundaries for which a = 2xg R. (0gi-0g2) is zero for all g. In some structures, stacking faults and twins are closely related, and different regular sequences of these defects produce various polytypes. Wollastonite is a relatively simple example of such a structure, for which the stacking faults have been studied in some detail by TEM, both by their a-fringe contrast and in two-dimensional high-resolution lattice images. 

High resolution lattice images, obtained by transmission electron microscopy and shown in Figure 2, confirm the swelling of MCM-22 precursor and the generation of... 

Transmission electron microscopy using high resolution lattice imaging techniques allows polytype analysis within single grains in the microstructure of dense SiC bodies [27],... 

On the other side of the present series, Kimizuka et al. prepared a series of compounds (RM03)(Zn0), (R Sc, In, Er, Tm, Yb, Lu M Fe, Ga, Al m = 2-11) and determined their stacking sequences based on the high-resolution lattice images and powder X-ray diffractions (Kimizuka et al. 1988, Kimizuka and... 

Fig. 28.54. High-resolution lattice image of a 4>-phase in the CeOz-La OB system showing closely-spaced fringes corresponding to the (001)a interplanar spacing and more or less ordered stacking faults reproduced by courtesy of Dr. F. Sibieude.

Figure 1. TEM micrographs and the SAED pattern (inset) of (a) a high-resolution lattice image of an individual 8 nm diameter nanoparticle, (b) an ensemble of discrete BaTi03 8 nm nanoparticles, (c) selforganization of BaTi03 nanoparticles, and (d) superlattice of 8 nm diameter BaTi03 nanoparticles[7].

---