REFINEMENT OF THE CRYSTAL-STRUCTURE OF BASI4O9 IN THE BENITOITE FORM

被引：24

作者：

FINGER, LW

HAZEN, RM

FURSENKO, BA

机构：

[1] CTR HIGH PRESSURE RES,WASHINGTON,DC 20015

[2] RUSSIAN ACAD SCI,INST MINERAL & PETROL,NOVOSIBIRSK 630090,RUSSIA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1995年 / 56卷 / 10期

关键词：

OXIDES; X-RAY DIFFRACTION; CRYSTAL STRUCTURE;

D O I：

10.1016/0022-3697(95)00075-5

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The crystal structure of BaSi4O9 with the benitoite structure, synthesized at 4 GPa and 1000 degrees C, has been refined using the method of Rietveld. This framework structure contains mixed four- and six-fold coordination for silicon and consists of double layers of three-membered tetrahedral rings that are cross linked by the octahedra. Barium atoms are situated in the channels of this framework. The relationship between this phase and another polytype with the higher density barium tetragermanate structure is not known; however, we favor a mechanism in which the transformation is induced by grinding at room pressure and temperature.

引用

页码：1389 / 1393

页数：5

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