Abstract
The structure of a new modification of the barium pentaborate β-Ba[B5O8(OH)] · H2O synthesized under hydrothermal conditions is investigated. This structure differs from the previously studied structure of the α-Ba[B5O8(OH)] · H2O compound by a shorter interlayer spacing and a higher degree of filling of the intersheet space with water molecules and barium atoms (the space group P\( \overline 1 \) is retained). The structure of the Ba2[B5O9] Cl · 0.5H2O pentaborate from the family of orthorhombic hilgardites (space group Pnn2) is refined, and the property of this crystal to generate the second optical harmonic is revealed. It is found that the previously studied pentaborate Ba5[B20O33(OH)4]H2O exhibits a nonlinear optical activity. The relationship between the structure and properties of hydrous and anhydrous pentaborates is discussed.
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