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A brief introduction of amorphous materials

by:Transmart     2020-05-31
Random human development of science and technology, there is a new amorphous crystalline material, including the amorphous alloy, amorphous conductor, amorphous superconductors, amorphous superconductors and organic polymer glass, etc. That what is amorphous materials, the following for everyone to do a simple and an introduction to the concept and characteristics. The so-called amorphous material is also known as amorphous or glassy state, it is a kind of rigid solid, has compared with crystalline material is of high hardness and high viscosity. Due to his composition of the yard, in a space arrangement is not a cyclical and translational symmetry in the he transformed the long process of the damage. Only by correlation function between atoms, let him in small areas of atoms or molecules in a short program. But so far there is no way to determine the atomic structure of amorphous materials. The following talk about the basic characteristics of amorphous materials. Program first because it is no longer, only a small area between the short program, so he wave vector K is no longer a description of the motion state of quantum number. The second electron diffraction. Neutron diffraction and X-ray diffraction diagrams and relatively wide halo and dispersion of the ring, she is under the electron microscope can't see any crystal boundary and crystal defect formation yan lining of contrast. Third, any be in metastable amorphous material, around a certain temperature rise in a row, on a very narrow temperature range has obvious structure changes, let him shift from amorphous to static. And the crystallization process depends on the atomic diffusion coefficient and interface of materials can be dissolved and entropy. Just told by the above general material properties of amorphous materials, in more different kinds of materials, they have some special features
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