Crystal structure of byelorussite-(Ce) NaMnBa2Ce2(TiO)2[Si4O12]2(F,OH) • H2O

被引：3

作者：

Zubkova, NV ^{[1
]}

Pushcharovskii, DY

Giester, G

Tillmanns, E

Pekov, IV

Krotova, OD

机构：

[1] Moscow MV Lomonosov State Univ, Dept Geol, Moscow 119992, Russia

[2] Univ Vienna, Geozentrum, Inst Mineral & Crystallog, A-1090 Vienna, Austria

来源：

CRYSTALLOGRAPHY REPORTS | 2004年 / 49卷 / 06期

基金：

俄罗斯基础研究基金会;

关键词：

Reflection; Crystal Structure; Large Cavity; Orthorhombic Unit Cell; Heteropolyhedral Framework;

D O I：

10.1134/1.1828140

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The crystal structure of the mineral byelorussite-(Ce) NaMnBa2Ce2Ti2Si8O26(F,OH) - H2O belonging to the joaquinite group was solved and refined to R = 0.033 based on 4813 reflections with I > sigma2(I). The parameters of the orthorhombic unit cell are a = 22.301(4) Angstrom, b = 10.514(2) Angstrom, c = 9.669(2) Angstrom, V = 2267.1(8) Angstrom(3), sp. gr. Ama2, and Z = 4. The structure is composed of three-layer sheets, which consist of dimers of edge-sharing Ti octahedra located between isolated four-membered [Si4O12] rings. The sheets are linked to each other by Mn 5-vertex polyhedra to form a heteropolyhedral framework. Large cavities in the framework are occupied by Na 6-vertex polyhedra, Ba 11-vertex polyhedra, and REE 9-vertex polyhedra. (C) 2004 MAIK "Nauka/Interperiodica".

引用

页码：964 / 968

页数：5

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