Hexagon plane

Fig. 45. Formation of Ice II (a) Hexagon plane of ice Ih with diagonal bond connections (b) up-down displacement of surviving hexagon columns (c) O j hex ring (strongly puckered) connected to 8 O j rings (almost flat) (d) unit cell of ice II (from Ref. 74>)...

This means that it is necessary to have a high degree of preferred orientation of hexagonal planes along the fiber axis if a high modulus is desired. To improve the orientation of graphite crystals, various kinds of thermal and stretching treatments. 

Graphite is midway between a semiconductor and a metal in electrical characteristics. The resistivity is very sensitive to impurities, and therefore to crystal perfection, and is directional, being two to three times greater in the basal plane than perpendicular to the plane. Properties measured in the hexagonal plane are independent of the direction within the plane, probably... 

For uniaxial (hexagonal) symmetry the 6 strain components are subdivided in two (invariant) one-dimensional subsets (indicated by the superscript a, and subscripts 1 and 2 for the volume dilatation and the axial deformation, respectively), and two different two-dimensional subsets, indicated by y for deformations in the (hexagonal) plane, and by e for skew deformations. These modes are also depicted in fig. 3. In this case, the magnetostriction can be expressed as... 

In graphite the distance between planes is 0.335 nm and the distance between carbon atoms in the hexagonal planes is 0.142 nm. Calculate the density of graphite. 

Pavlov, G. N. 1990 Determination of parameters of crystal latticed surfaces composed of hexagonal plane facets. Int. J. Space Structures 5, 169-185. 

We conclude this summary by pointing to the anomalies in the magnetic susceptibility as a function of temperature and, at low temperature, as a function of an applied magnetic field. In the low-field susceptibility of the hexagonal plane, we observe a maximum around Tmax 15 K, whereas the... 

The data on these five hexagonal metals are not complete enough to make any generalizations. There does seem to be, however, a definite tendency for the dose packed planes of the oxide to form parallel to the hexagonal planes of the metal with the close packed rows of atoms in these planes parallel. 

Figure 7.2 The projection of the T-atom configuration in zeolite L (a) compared with two-dimensional modeling results (b)-(f) based on a hexagonal plane cell, P6mm, with a — 18.4 A...

For the oblique and hexagonal plane lattices, these are given by ... 

Carbon Fibers Pyrolysis of organic fibers under tension yields the aforementioned carbon fibers (Section 1.2.3), the hexagonal planes of which are oriented in parallel to the initial strain. The most common starting material is polyacrylonitrile (PAN). The covalent connection of atoms along the fiber s axis provides the material with high strain resistance and a large modulus of elasticity. 

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