Constitution of network structures with large. inner spaces with antimonate ions

构成网络结构规模大。

基本信息

批准号：
18550050
负责人：
IMOTO Hideo
金额：
$ 2.63万
依托单位：
Utsunomiya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Investigation of the network structures constructed with antimony and indium oxides led to the synthesis of a new compound LiIn_2SbO_6. We measured the X-ray and neutron powder diffraction data, and determined its crystal structure by Rietveld analysis. The structure had no disorder and the space of the Li site was not so large as expected. On the other hand, when larger alkali metals like potassium were used instead of lithium, antimony-indium oxide networks of the hollandite-type structure with larger tunnels were formed. Furthermore, the antimony-oxide network of the hollandite-type could include not only indium but also transition elements. We were interested also in the pyrochlore structures with large cavities, and investigated ASbWO_6 systems (A: alkaline elements). If sodium was used as the alkaline element, a new form of NaSbWO_6 was formed though the compounds with the cubic pyrochlore structure and an orthorhombic structure had been reported. The Rietveld analysis of the powder X-ray data of the new form showed that the structure was similar to the orthorhombic LiSbWO_6 but had a new monoclinic structure slightly deformed from the orthorhombic structure. When lithium was used as the alkaline element, an oxide with a pyrochlore-like structure was obtained, and the structure was different from the reported one. These experimental results indicated that the network structures with antimony oxide systems constructed by the synthetic reactions were not confined only in those that were thermodynamically most stable. Therefore, if we could find suitable synthetic procedures, we could build a wide range of network structures with antimony oxide systems.

对用锑和氧化物构建的网络结构进行的研究导致合成新的化合物liin_2sbo_6。我们测量了X射线和中子粉末衍射数据，并通过Rietveld分析确定了其晶体结构。该结构没有混乱，Li地点的空间不像预期的那样大。另一方面，当使用较大的碱金属而不是锂时，形成了荷兰石型结构的锑 - 氧化物网络，形成了较大的隧道。此外，荷兰石类型的锑氧化物网络不仅包括鉴赏剂，还包括过渡元素。我们也对具有较大空腔的Pyrochlore结构感兴趣，并研究了Asbwo_6系统（A：碱性元素）。如果将钠用作碱性元素，则形成了一种新形式的NASBWO_6，尽管具有立方倍裂结构的化合物，并且已经报道了正交结构。对新形式的粉末X射线数据的Rietveld分析表明，该结构与正骨lisbwo_6相似，但具有从原骨结构中略微变形的新单斜结构。当将锂用作碱性元素时，获得了具有pyrochlore样结构的氧化物，该结构与报道的氧化物不同。这些实验结果表明，与合成反应构建的氧化氧化氧化物系统的网络结构不仅限于热力学上最稳定的氧化物系统。因此，如果我们能找到合适的合成程序，我们可以使用锑氧化物系统构建广泛的网络结构。