Crystal chemistry is currently developed in two main practically important areas. The first of them is the creation of single crystals with the maximum perfect and uniform structure, which are promising as materials for converting, controlling, and generating laser radiation [1—3]. The second area is the formation of clusters as micro- and nanosized heterogeneities of the fractal type and also as periodically polarized domains of substructural sizes in the structure of a real crystal under nonequilibrium crystallization conditions [4]. It is the second area that provides a unique possibility to relate the crystal chemistry proper to nanotechnologies, a most advanced, promising, and significant modern branch.
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