System, crystal types

Fig. 4.14 Magnetically perturbed quadrupole spectra simulated for powder distributions of the EFG (Vzz > 0) with an applied field B = 4T which is fixed in the laboratory system perpendicular to the y-beam/ The value of the quadrupole splitting is kept constant at AEq = +4 mm s For negative quadrupole splitting (V z < 0), the spectra would be inverted on the velocity scale. Note the difference in relative intensities for the spectrum for ry = 0 and the single-crystal type spectrum given in Fig. 4.13. Similar patterns are obtained for B y...

Green hexagonal crystal system corundum type structure density 5.22 g/cm3 melts at 2,330°C vaporizes above 3,000°C insoluble in water and alcohol. 

Crystal System Lattice Types hkl Restrictions Unit Cell Constraints... 

Any system of type II over a scheme S is transformed into a system of crystals by the crystalline cohomology functor. In this section we will describe a normal form for such a system of modules. Let S be a scheme and let... 

The RIn3 systems crystallize in the cubic AuCu3 type of structure and are known for salient features as valence fluctuations and the presence of various magnetic structures (see e.g. 

X-Ray Methods. A camera with a curved quartz crystal monochromator served to identify the crystal type of the sulfide under study and to verify that it belonged to a single-phase system. To reduce the effect of the titanium fluorescence excited by the copper radiation used, an aluminum filter 0.03 mm. thick was... 

Crystalline compounds exist in a great many crystal forms. The accepted method for the crystallographic classification of crystals is based on the angles between the crystal faces. In this classification system, the types of crystal forms are not related to the relative sizes of the crystal faces, since the relative development of the faces is characteristic of the specific material. The cubic system, for example, is characterized by the fact that the faces of a cubic crystal can be referred to three equal and mutually perpendicular axes. The actual macrocrystal may be a cube, a needle, a plate, or an aggregate of imperfect crystals. 

Figure 1.11 (a) Single crystal type (selected orientations of 0 = 0°, 55° and 90°) and (b) first derivative powder type EPR lineshapes for a randomly oriented S = 1 /2, / = 1/2 spin system with uniaxial symmetry. The angular dependence curve (0 vs field) for m, = 1/2 is shown in (c). 

Calculations Determining the unit cell type from the measured density and atomic radius of metals in the cubic system the atomic radius of a metal atom is determined from the crystal type and the edge length of a unit cell, which are both obtained by x-ray diffraction (see Major Technique 3 in text). 

Typical flow diagrams for both stirred tank and fluidized bed resolution systems are shown in Figs. 7-26 and 7-27. They are shown, respectively, as series flow for the CSTR crystallizer system and parallel flow for the fluidized bed operation, but the decision to run in series or parallel is affected only slightly by the crystallizer type. 

Crystal System Lattice Types Axial Ratios Axial Angles ... 

Crystal system (Lattice type) Lattice symbol Lattice parameters... 

Type A crystals always give spectra of Type (ii), and indeed Hadii has successfully predicted this crystal type from spectral data. It must be emphasized, however, that Type (ii) spectra are also given by systems not of Type A (95a), and not even crystalline. But they are always associated with very short hydrogen bonds. 

Name Formula Crystal system Structure type z... 

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