Crystal structure of new decaborate Na2Ba2[B10O17(OH)2]

被引:12
|
作者
Vinogradova, SA [1 ]
Pushcbarovsky, DY
Arakcheeva, AV
Dimitrova, OV
机构
[1] Moscow MV Lomonosov State Univ, Fac Geol, Moscow 119899, Russia
[2] Russian Acad Sci, AA Baikov Met Inst, Moscow 117334, Russia
基金
俄罗斯基础研究基金会;
关键词
D O I
10.1134/1.1446904
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
The crystal structure of a newly synthesized compound Na2Ba2[B10O17(OH)(2)] has been determined (Syntex P (1) over bar diffractometer, MoKalpha radiation, 1784 crystallographically nonequivalent reflections, anisotropic approximation, R = 1.7%). The parameters of the monoclinic unit cell are a = 11.455(7), b = 6.675(4), c = 9.360(7) Angstrom, beta = 93.68(5)degrees, Z = 2, sp. gr. C2. The structure consists of double pseudohexagonal layers built by BO4-tetrahedra and BO3-triangles forming three-membered rings of two mutually orthogonal orientations. The neighboring layers along the [001] direction are bound by Na-polyhedra and hydrogen bonds with participation of OH groups. The interlayer tunnels along the [100] direction are filled with columns of Ba-polyhedra. The crystallochemical characteristics of a number of synthetic Ba-borates (to which the structure of new decaborate is related) are considered in terms of borate building blocks singled out in the structure. (C) 2002 MAIK "Nauka/Interperiodica".
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页码:24 / 28
页数:5
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