Abstract
Single crystals of alkali halides have recently attracted more and more scientific and practical interest. These compounds have a number of valuable properties. They are transparent over a wide spectral range, including the whole visible and near-infrared regions as well as a considerable part of the ultraviolet spectrum, and they have lattices of the purely ionic type, crystallizing in the cubic system. Methods of growing very large alkali halide single single crystals are now known; also phosphors may be prepared from alkali halides without melting (and thus disrupting the crystal lattice both spectrally and chemically). All this has made alkali-halide crystals subjects for study, both in connection with discovering the nature of the luminescence of crystalline substances and in studying a wide variety of processes taking place in dielectrics and semiconductors [1].
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