Herring bone pattern

Plate 27. Large-scale image of the Au(lll)-22X-y/F recc truction. The Au(lll) surface reconstructs at room temperature to form a 22Xy/3 structure, which has a two-fold symmetry. On a large scale, three equivalent orientations for this reconstruction coexist on the surface. Furthermore, on an intermediate scale, a herring-bone pattern is formed. See Barth et al. (1990) for details. Original image be courtesy of J. V. Barth. 

Fig. 2.70 Structure of RcjB-type, (3, 3)ccpRe3 B , projected on (lOO)." Large circles are metal atoms and small ones are boron atoms. The figure shows on the left, the herring-bone pattern of <110>Nacb in the centre, the Reg empty octahedra and on the right, the RegB trigonal prisms. The arrows indicate the twin planes and the unit cell is indicated.

The lower the body moisture content the higher the plastic body attrition forces it is thus easily understandable that, whatever the other parameters of the extrusion process described above, that the water contained in the ceramic mass must provide the body with enough cohesion to equilibrate the attrition forces with the extrusion walls and the extrusion mouth. Should this not be so, the result will be fissures crossways to the direction of extrusion that are concentrated at the edges of the formed body (herring bone pattern). 

It must be remembered that in addition to the subdivision of the crystal into Smekal blocks, each block may have its own glide planes and that glide planes may act as regions for further break-up of the crystal block, or for preferential diffusion into the block. Palladium, after sorption of hydrogen, shows not only a block structure, but also a herring-bone pattern on the surface of each grain or block (2i, 22) which has been attributed to preferential penetration of hydrogen down slip planes. 

Fig. 5. (a) The herring bone pattern cage type structure in a schematic (bottom) and in a more realistic (top) presentation, the latter taken from the a-cyclodextrin-(H20)-4H20 structure [13]. In the schematic drawing, the a-cyclodextrin cavities are indicated by hatching. 

Fig. 4.12. Feline oesophagus. The characteristic herring bone pattern of the feline oesophagus in a patient with gastro-oesophageal reflux...

Figure 6.46. Some examples of liquid inclusions in crystals, (a) a regular pattern in ammonium perchlorate, (h) random aligned inclusions in potassium iodide, (c) an hourglass pattern in sucrose and (d) herring-bone inclusions in sucrose...

The left-hand and right-hand sections have a herring-bone groove pattern with a smooth part in the middle. The centre section is completely smooth and acts as a seal between the compression chamber and the surroundings. 

Cleavage. This is the splitting of a crystal in a crystallographic plane. A cleavage fracture is marked by characteristic pattern, such as river markings, herring bones, tongues, etc. 

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