Chm 411 Part C Physical Techniques in Inorganic Chemistry
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چکیده
DIFFRACTION METHODS: The method allows for the unambiguous determination of the position of the atoms and ions that make up a molecular or ionic compound and description of structures in terms of features such as bond lengths and angles relative positions of ions and molecules in a unit cell. Structural data obtained are useful in interpretation of ionic and atomic radii useful in prediction of structures and trends in many properties. X-RAY DIFFRACTION:Diffraction is the interference between waves that occurs as a result of an object in their path. X-rays are scattered by the electrons in atoms and diffraction can occur for a periodic array of scattering centres separated by distances similar to the wave length of the radiation of approximately 100pm, such as exist in a crystal. Diffraction is equivalent to a reflection from two adjacent parallel planes separated by a distance, d, the angle after which constructive inference occurs between waves of wave length, λ is given by the Bragg equation. 2dsinθ = λ (1)
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LECTURE NOTES ON CHM 312: INORGANIC CHEMISTRY III DEPARTMENT OF CHEMISTRY, UNIVERSITY OF AGRICULTURE, ABEOKUTA(UNAAB) LECTURERS IN CHARGE Dr.(Mrs)
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تاریخ انتشار 2011