Synthesis, crystal structure features, IR-spectrocopy and properties of natural calcium metaborates synthetic analogs and new Na,Ca carbonate–borateстатья
Дата последнего поиска статьи во внешних источниках: 23 ноября 2017 г.
Аннотация:The hexahydroborite analog Ca[B(OH)4]2·2Н2О (I), fabianite dimorph synthetic СаВ3O5(ОН) (II), and new Са,Na-carbonate-borate Ca2Na(NaxCa0.5–x)[(OH)(O1–xOHx)](CO3)(x~0.4) (III) have been synthesized by the hydrothermal method at t = 250°C and P = 70–80 atm: (I) via the recrystallization of calciborite CaB2O4 (M) in the system M–B2O3–H2O, (II,III) in the system Са(OH)2–H3BO3–Na2CO3–NaCl. The crystal structures of three borates were refined by the least-squares method with anisotropic displacement parameters (H atoms were located) and final R1 = 0.0260(I), 0.0428(II), 0.0387(III).
Keywords:calcium metaborate, hydrothermal method, hexahydroborate, fabianite, carbonate-borate, nonlinear-optical properties