Crystal crystal grows in crystal crystal cave, grow on crystal seed slowly, because of various geological condition restrict, have face, edge, horn transparent water crystal, individual has big and small, small than big rice grain still small, big can very big. The largest crystal found in the world is now 5. 5 meters, diameter 2. 5 meters, weighing more than 40 tons, said the world’s crystal crystal.
Because the ions or atoms on the surface of the crystal have unsaturated bonds, they have great reactivity, and the surface structure is asymmetric, which causes the lattice to be greatly bent and deformed, so the energy is higher than the internal energy, which is a defect.
(1) small-angle grain boundary (inlay block)
The small crystal blocks with dimensions of 10-6-10-8m intersect with each other at a slight () Angle of several seconds, forming the Mosaic structure. Some people think that the grains are edge dislocation.
(2) large-angle grain boundary. The orientation of each crystal surface is different, and the intersection Angle is large. In polycrystals, the large-angle grain boundary may appear. In this kind of grain boundary, the vertex arrangement is close to disordered state, and the grain boundary is the defect position, so the energy is high, and foreign particle can be adsorbed. Grain boundary is a fast channel for the diffusion of atoms or ions, and also a place for the elimination of vacancy. This special effect plays an important role in solid phase reaction, sintering, and has a great influence on the mechanical properties such as creep, strength and other mechanical properties of polycrystalline materials such as ceramics and refractories, as well as the dielectric properties such as polarization and loss.Crystal Plaque suppliers
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