2006•Crystallography ReportsRequires access
Crystal structure of the new barium borate Ba5(BO3)2(B2O5)
N. G. Furmanova, B. A. Maksimov, V. N. Molchanov, А. Е. Кох, Н. Г. Кононова, П. П. Федоров
Open publisher page 24 citations
Abstract
The crystal structure of the new barium borate Ba 5 (BO 3 ) 2 (B 2 O 5 ) is established ( R = 0.0436). Single crystals were grown by spontaneous crystallization in the BaO-B 2 O 3 -Na 2 O system using the flux method. This compound crystallizes in the orthorhombic system, sp. gr. P 2 1 2 1 2 1 ; the unit-cell parameters are a = 9.590(2) Å, b = 16.659(3) Å, c = 22.919(6) Å, and Z = 12. The structure consists of coordination polyhedra of barium cations and the anionic groups [BO 3 ] (planar triangles) and [B 2 O 5 ] (vertex-sharing double [BO 3 ] triangles), which form a pseudohexagonal framework. Melting of barium borate occurs by a peritectic reaction at 1170 ± 10°C.