Transformations of the Crystal Structure in a Series of Rubidium Boroleucite Solid Solutions from the X-ray Powder Diffraction Data

被引：0
作者：
M. G. Krzhizhanovskaya
R. S. Bubnova
S. K. Filatov
D. Meyer
P. Paufler
机构：
[1] St. Petersburg State University,Department of Crystallography
[2] Russian Academy of Sciences,Grebenshchikov Institute of Silicate Chemistry
[3] Technische Universitat,Dresden Institut für Strukturphysik
来源：
Glass Physics and Chemistry | 2003年 / 29卷
关键词：
Polymer; Crystallization; Crystal Structure; Solid Solution; Boron;
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摘要：
The crystal structures of rubidium boroleucite RbBSi2O6 [a = 12.785(1) Å] and two silicon-rich solid solutions Rb0.96(B0.77Si2.18)2.95O6 [a = 12.858(1) Å] and Rb0.92(B0.46Si2.42)2.88O6 [a = 12.914(1) Å] are refined in the space group I4¯3d (KBSi2O6 structural type) by the Rietveld method. Polycrystalline samples are prepared through the crystallization of glasses. The substitution Si4+ → B3+ in tetrahedra of the borosilicate framework occurs with the charge compensation due to a deficit of rubidium and boron. The formation of vacancies in tetrahedral positions leads to the breaking of bonds between tetrahedra, and bridging oxygen atoms become terminal atoms.
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页码：599 / 608
页数：9
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