Hexagonal crystal

Physical form Solid metal Cubic crystals Hexagonal crystals Hexagonal crystals... 

Ryu, Fl.-Y., Notomi, M., Kim, G.-Fl. and Lee, Y.-H., 2004, Fhgh quality-factor whispering-gallery mode in the photonic crystal hexagonal disk cavity. Opt Express 12(8) 1708-1719. 

Colorless glassy solid or vitreous crystal hexagonal crystal system slightly hitter taste hygroscopic density 2.55 g/cm melts at 450°C vaporizes at 1,500°C slightly soluble in cold water (3.3%), soluble in alcohol and boiling... 

Colorless powder or crystal hexagonal crystal system hygroscopic density 4.047 g/cm3 melts at 560°C vaporizes at 960°C highly soluble in water (140 g/lOOg at 20°C), also soluble in acetone slightly soluble in alcohol insoluble in ether. 

Reddish violet crystals hexagonal plates density 2.87g/cm3 melts at 1,152°C decomposes at 1,300°C shghtly soluble in water. The color of hexa-hydrates range from light-green to violet all are hygroscopic density 1.76 g/cm3 soluble in water and ethanol insoluble in ether dilute aqueous solutions are violet in color. 

Pinkish-red translucent crystals hexagonal-rhombohedral structure refractive index 1.597 density 3.70 g/cm hardness 3.8 Mohs decomposes above 200°C slightly soluble in water Ksp2.24xl0-ip soluble in dilute acids. 

Cadmium sulfide [68859-25-6], CdS, Mr 144.48, occurs as greenockite or cadmium-blende in several natural deposits, which are, however, of no importance as pigments. The mineral crystallizes hexagonally in the wurtzite lattice (a-form). 

The disulfide (WS2) is the only stable compound which can be synthesized directly from the elements. Previous literature data are compiled in Refs.6-8 The W—S system presented in Fig. 9 is based on literature data and schematically illustrates possible phase relations. Normally, WS2 crystallizes hexagonally and has the same structure as molybdenite under certain conditions, however, a rhombohedral... 

Nevertheless, the shape of crystals is really a secondary characteristic, since it depends on, and is a consequence of, the interior arrangement of atoms. Sometimes the external shape of a crystal is rather obviously related to its smallest building block, the unit cell, as in the httle cubical grains of ordinary table salt (NaCl has a cubic lattice) or the six-sided prisms of natural quartz crystals (hexagonal lattice). In many other cases, however, the crystal and its unit cell have quite different shapes gold, for example, has a cubic lattice, but natural gold crystals are octahedral in form, i.e., bounded by eight planes of the form 111. ... 

Fig. 3-10 Rotating-crystal pattern of a quartz crystal (hexagonal) rotated about its c axis. Filtered copper radiation. (The stress are due to the white radiation not removed by the filter.) (Courtesy of B. E. Warren.)...

Crystals, hexagonal system, usually obtained as flat rhombohedra and contg 0.4% Zn. Readily sol in dil acids and alkalies. Exists as the dimer in mild acid and as the monomer in 30% acetic acid, practically insol from pH 4-5 to 7.0. Isoelectric point 5.30 to 5.35. 

Crystal Hexagonal Cubic face centered Cubic face Hexagonal Cubic face centered Cubic face centered... 

In the meantime the quasiplanarity, predicted in Ref. [2], has theoretically been confirmed by several authors . On the other hand, Perkins el af. experimentally confirmed that, by breaking intra-icosahedral bonds on the (100) surface of icosahedral solid YBee crystals, hexagonal and pentagonal pyramidal forms are observed as open umbrellas . Due to the fact that pure boron spheres like B32 are less stable in comparison to boron sheets or tubes, in the present work we look for the stabilizing effect of the hydrogen atoms by eliminating the dangling bonds in the boron spheres. 

INTRODUCTION This data sheet summarizes properties of single crystal hexagonal selenium. 

Alternatively, a process based on the combustion synthesis starting with the elements initiated by electric field activation has been used by Xue and Munir [325]. Likewise, homogeneous single-phase AlN-SiC solid solution powders with well-crystallized hexagonal morphologies and a fine particle size of 3 pm have been obtained by Mei and Li through the combustion reaction of aluminum, carbon, and Si3N4 powder mixtures in air [326]. 

Three-dimensional (3D) crystal, hexagonal lattice, upright alignment... 

FIGURE 5 (a) TEM of iUite crystal hexagons and illite/smectite mixed clay laths (b) HRTEM of illite crystaUites prepared perpendicular to the beam, showing 10-A bands of stacked Uhte layers. (Reproduced with permission of Kluwer Academic Publishers from Ref. 8.)... 

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