Cu1.1Ta11O26.2F4.8:: a tetragonal-tungsten-bronze-related structure with square planar coordination of copper

被引：2

作者：

Askeljung, C ^{[1
]}

Lundberg, M ^{[1
]}

Sundberg, M ^{[1
]}

机构：

[1] Univ Stockholm, Arrhenius Lab, Dept Inorgan Chem, S-10691 Stockholm, Sweden

来源：

INTERNATIONAL JOURNAL OF INORGANIC MATERIALS | 2000年 / 2卷 / 06期

关键词：

crystal structure; copper-tantalum-oxide-fluoride; HRTEM; tetragonal-tungsten-bronze;

D O I：

10.1016/S1466-6049(00)00068-4

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The crystal structure of Cu1.1Ta11O26.2F4.8 was determined by single crystal X-ray diffraction in combination with HRTEM. The unit cell is orthorhombic with a=17.7128(8), b=17.1832(7) and c=3.9412(1) Angstrom (X-ray powder data), space group Cmmm, and R=0.0327 for 594 independent reflections. The structure is related to the tetragonal tungsten bronze type structure of KNb6O15F which has 50% of the five-sided tunnels transformed into pentagonal bipyramids. The composition of the framework is CuTa11(O,F)(31), with Cu in square planar coordination linking to two pentagonal TaX7 bipyramids. The additional Cu atoms are located in the five-sided tunnels. The composition given to the compound was established by the X-ray refinement. The HRTEM study showed planar faults, twin and grain boundaries in the crystals. EDS-analysis indicated a somewhat higher Cu-content. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：469 / 476

页数：8

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