Example of unusual tetrahedral coordination of Cu(I) in oxides: Cub>3b>VOb>4b>

详细信息	查看全文 | 推荐本文 |

• 作者：N. Barrier ; M. Hervieu ; N. Nguyen ; B. Raveau
• 关键词：Cu(I) tetrahedral coordination ; Electron microscopy ; X-ray powder diffraction ; Rietveld refinement ; Crystal structure
• 刊名：Solid State Sciences
• 出版年：2008
• 期刊代码：98_12932558
• 类别：ch
• 出版时间：February 2008
• 卷：10
• 期：2
• 页码：137-140
• 文件大小：468 K

摘要

The crystal structure of the copper vanadate Cub>3b>VOb>4b>, determined by X-ray powder diffraction, shows tetrahedral coordination of Cu(I) which is particularly unusual in oxides. Cub>3b>VOb>4b> presents a tetragonal unit-cell, isotypic to the famatinite Cub>3b>SbSb>4b>, with the following parameters: a = 4.57531(9) Å; c = 8.9918(3) Å; space group I-42m. Its structure can be described as a three dimensional framework of corner shared CuOb>4b> and VOb>4b> tetrahedra, distributed in an ordered way and forming pure copper-oxide layers [Cub>2b>Ob>4b>]b>∞b> alternating with mixed copper/vanadium oxide layers [CuVOb>4b>]b>∞b>. In the latter one observes a 1:1 ordering of the CuOb>4b> and VOb>4b> tetrahedra forming [CuVOb>3b>]b>∞b> chains running along the [110] direction.