Structural aspects in crystal growth of anhydrous boratesстатья
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Аннотация:A crystallochemical interpretation of acid-base properties was developed for the numerous anhydrous borates. A quantitative estimation was made of the correlation between the ratio of the numbers of B3+O2− ions and the oxygen activity coefficient. The stability of borate structures depends on the delocalization of formal charges of the BnOm anions as a result of their polymerization. This analysis and experimental studies consistently explain the high activation energy of borate crystallization by the polymerization of BO3 triangles and BO4 tetrahedra in their melts and fluxed melts. It also sets forth the judicious choices of phase systems for the growth of borate crystals. In particular, in order to obtain the orthoborate crystals, a wide range of flux agents can be proposed which destroy boron-oxygen polymers and intensify mass transfer in the fluxed systems.