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By Dinker B. Sirdeshmukh, Lalitha Sirdeshmukh, K.G. Subhadra

The ebook offers with atomistic houses of solids that are made up our minds through the crystal constitution, interatomic forces and atomic displacements prompted by way of the results of temperature, tension and electrical fields. The e-book supplies equivalent significance to experimental information and idea. There are complete chapters devoted to the tensor nature of actual homes, mechanical houses, lattice vibrations, crystal constitution selection and ferroelectricity. the opposite crystalline states like nano-, poly-, liquid- and quasi crystals are mentioned. a number of new themes like nonlinear optics and the Rietveld strategy are provided within the booklet. The booklet lays emphasis at the function of symmetry in crystal homes. Comprehensiveness is the power of the ebook; this permits clients at various degrees a decision of chapters in response to their requirements.

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To facilitate crystal growth, the system should be in equilibrium with a small temperature difference between the nutrient and the growing crystal surface. The parameters to be controlled are the supersaturation, the growth temperature, the rate of vapour transport and the flow of any entraining gas. Vapour growth is carried out in two ways: direct condensation and chemical transport. In the first method, as the term indicates, the vapour of the material to be grown directly condenses on the walls of the growth vessel or a substrate.

36 Details of ampoule used in MCM: 1 – closed glass or quartz ampoule, 2 – polycrystalline material, 3 – single crystal stability of the substrate. The chemical transport method facilitates the growth of Ge at much lower temperatures (400–600ıC) by using the reaction 2 Ge C 2I2 600ı C ! 2 GeI2 400ı C ! 10) 42 2 Crystal Growth Fig. 37 CdS crystal grown by MCM Fig. 38 Chemical transport system set-up for growth of Ge The necessary set-up is shown in Fig. 38. Iodine powder is kept in a pyrex glass tube which is in a thermostat that maintains a temperature of 70ı C.

3 Habit changes due to impurities in some crystals grown from aqueous solution Substance KCl KBr CsCl NaCl Pb(NO3 /2 NaClO3 MgSO4 7H2 O KAl(SO4 /2 7H2 O Impurity – Urea Bromobenzene Aniline, phenol Pb2C Hg2C – Pb2C Ti4C – La3C , Ce3C , Gd3C – Urea HgCl2 Alanine Glycine – Methylene blue – Na2 SO4 – Na2 B4 O7 10H2 O – KOH, Na2 CO3 Crystal polyhedron faces 100, hexahedron 411 Hexoctahedron 111, 100 100, 111 100, hexahedron 111, 100 100, 111, 110 100, 110, 111 100 100, hexahedron 100, 111, 110 100, 110 111 110 111 100 Cube Tetrahedron Rhombic prismatic Tetrahedron 001, 111, 011, etc.

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