Frenkel Defects in Alkali Halides
نویسندگان
چکیده
منابع مشابه
Defect pressure, formation volume, and temperature dependence of formation properties of point defects in ionic solids
— The concept of local defect pressure is developed and is applied to determine the elastic relaxation about point defects in ionic solids. The method is superior to that of Kanzaki forces for treatment of Coulomb and many-atom interactions. The lattice sums for the Coulomb interaction and the relaxation volume of Schottky defects in NaCl and KC1 in the static limit are given; the use of neutra...
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Some investigations were performed to obtain more information about the production of defects in alkali halides during X-irradiation. Combined measurements of tIie macroscopic volume change and the change of the Iattice parameter of KC1 were performed. Color centers in additively colored KC1 are formed from Schottky-defect vacancies, whereas in X-irradiated KC1 they are formed from vacancies wh...
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The quantum mechanical description of atomic spectra was the beginning of a new era of quantum physics which today is the theoretical basis of nuclear and solid state physics, chemistry, and biochemistry [1,2]. Quantum mechanics opened also a new look to solid state physics which will be illustrated by the development of the conception of excitons [3]. One of the basic quantum mechanical proble...
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The experimental results on two-photon spectroscopy in impurities and defects in solids are reviewed. The main results are the measurement of absorption cross sections and in some cases the assignement of the symmetry of the transitions. Nonlinear effects can be of importance also in the process of colour centre formation in alkali halides crystals.
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We have predicted the phase transition pressure in some alkali halides using an interatomic potential approach based on rigid ion model. This potential form represents the composite form of the inverse power dependence and exponential dependence of the repulsive energy on interionic distance. Some thermoelastic properties such as second order elastic constants have been calculated using the sam...
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