Tetragonal crystal lattice

A similar effect has been observed in the measurement of the linear expansion coefficient S in TmV04 (Kazey and Sokolov 1986). The contribution to the value of 5 from the CITE does not vanish at T TJy, but continues up to T 3T . Kazey and Sokolov (1986) have connected such a behaviour of d T) with the presence of significant distortions in the tetragonal crystal lattice of TmV04 at T> Tjt-... 

White tin (or /1-Sn) has a body-centered tetragonal crystal lattice (with lattice parameters a = b = 0.583 nm and c = 0.318 nm), for which essentially anisotropic... 

Fig. 63. (a) The hexagonal AlBj type crystal structure of the RGaj compounds. Spheres with and without pattern show the Ga atoms and the R atoms, respectively (b) Brillouin zone of the body-centered tetragonal crystal lattice for da > -Jl. 

The pure metal tin stannum Sn) exists in two different allotropic forms. At higher temperatnres, the stable form is a silver-white metal of poor hardness. This modification, so-called white tin or /3-Sn, deposits in a tetragonal crystal lattice with density 7285 kg/m . At lower temperatnres, the stable modification is a grey metalloid form. This low-temperature modification, so-called grey tin or a-Sn, deposits in a cubic crystal lattice with density 5769 kg/m. ... 

Figure 8.11 Transformation of a tetragonal crystal, with lattice parameters aT = bT, into a multiply twinned orthorhombic crystal with lattice parameters a0, bQ. The twinned regions are often called domains and the boundaries may occur on a variety of crystallographic planes.

Tetragonal crystal system, 8 114t Tetragonal lattice structure, of silicon, 22 482... 

Continuing with our survey of the seven crystal systems, we see that the tetragonal crystal system is similar to the cubic system in that all the interaxial angles are 90°. However, the cell height, characterized by the lattice parameter, c, is not equal to the base, which is square (a = b). There are two types of tetragonal space lattices simple tetragonal, with atoms only at the comers of the unit cell, and body-centered tetragonal, with an additional atom at the center of the unit cell. 

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