Solid assignment help by online chemistry tutors

June 21, 2012 - PRLog -- The solids can be of two types - crystalline and amorphous. Those solids which are formed due to regular repetition of identical building blocks are called crystals. It is like having a collection of identical bricks which could be arranged in some regular fashion to construct a wall. On the other hand, there are solids which do not appear to have any regular internal arrangement in every part and thus do not show regular shape; these are called amorphous solids. Amorphous solid means solid without regular form. Glass, polyethylene as in plastic bags, etc., are common examples of amorphous substances. Though the study of amorphous substances is also quite useful and interesting,
Different crystalline structures are associated with different physical properties. Further, the theories of metallic bonding and semiconductors are also explained with particular reference to electrical conduction.

In understanding the physical and chemical properties of solids. Crystal structures are usually determined with the help of X-rays. In addition to X-rays, other forms of radiations having similar properties-like a beam of neutrons or electrons could also be used. We know that X-rays are electromagnetic radiations of wavelengths much shorter' than either visible or ultraviolet light. In 1911, Vander wall showed that whenever the wavelength of radiation is of the same order of magnitude as the size of the particle in a material, the radiation would be diffracted by the particle. In 1912, Laue suggested that since the order of the magnitude of the wavelength of X-rays and the crystal lattice distances are the same, we should expect diffraction of X-rays by crystals. This was soon confirmed experimentally by Friedrich and Knipping.

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