Proceedings PaperNonlinear optical anhydrous borates: the peculiarities of crystal growth
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Crystals Ral3(BO3)4 (R equals Y, La and lanthanoids), (beta) -BaB2O4, and LiB3O5 serve for laser radiation conversion from ultraviolet to mid-IR. The process of their flux crystallization is limited by a specific process for each material. In the case of RAl3(BO3)4 it is the separation of the BO3-triangles. For (beta) - Ba2O4 the limiting factor is the formation of isolated threefold rings B3O6. Finally, regrouping of three-dimensional polymers limits the crystallization of LiB3O5. These processes are usually accompanied by the change of coordination number of B from 4 to 3 and vice-versa. For YAl3(BO3)4 the growth activation energy is as much as 335 kJ/mole. For crystal growing, the limiting concentration of borates are: 20 - 30 wt% (system RAl3(BO3)4- K2Mo3O10 - R2O3 - B2O3), 59 wt% (NdAl3(BO3)4 - BaO (DOT)2Ba2O3), 77.5 mol.% (BaB2O4 - Na2O), and 97 mol.% (LiB3O5-B2O3).