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Are higher order structures present in coordination-polyhedron structures of alloys, just like proteins?

合金的配位多面体结构中是否存在高阶结构，就像蛋白质一样？

基本信息

批准号：
18360306
负责人：
KOYAMA Yasumasa
金额：
$ 10.39万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
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

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360306/
关键词：
coordination polyhedron atomic column nanometer-sized metastable state higher order structure hierarchy of crystal structures covalent bond transmission electron microscopy intermetallic compound 拡散・相変態・状態図

项目摘要

Coordination-polyhedron structures found in intermetallic compounds involving 3d-transition metals are characterized by the presence of complex coordination(CN) polyhedra such as a CN12 polyhedron. Because these polyhedra can be regarded as structural units, our motivation of this study is based on a simple question whether higher order structures are present in coordination-polyhedron structures or not, just as in the case of proteins. To get an answer of this question, in this study, we have tried to identify higher order structures in the g. and R structures of the Fe-Mo alloy system, where CN12, 14, 15, and 16 polyhedra are involved Concretely higher order structures in these two structures were determined on the basis of atomic arrangements of metastable states appearing in solid-state reactions from the bcc structures to them. The present experimental data obtained by transmission electron microscopy clearly revealed that there existed metastable states for both cases : the disordered atomic-column state and the short-range ordered state of atomic-column blocks in the μ case, and another disordered atomic-column state and the domain-structure state consisting of nanometer-sized atomic-column regions in the R case. Based on the appearance of these metastable states, we tried to determine higher order structures in the μ and R structures. As a result, four higher order structures related to a CN12 polyhedron are present in the structure, while there are two structures in the R structure, one of which is a CN16 polyhedron as a primary one. Thus the presence of these higher order structures in the μ and R structures is indicative of the fact that coordination-polyhedron structures in intermetallic compounds involving 3d-transition metals should have the hierarchy of crystal structures, which is directly associated with the formation and development of covalent bonds in a metallic system.

配位-多面体结构在涉及3D过渡金属的金属间化合物中发现，其特征是存在复杂的配位多面体，如CN12多面体。由于这些多面体可以被视为结构单元，我们进行这项研究的动机是基于一个简单的问题：配位中是否存在高阶结构-多面体结构，就像蛋白质一样。为了得到这个问题的答案，在本研究中，我们试图确定Fe-Mo合金系统G和R结构中的高阶结构，其中具体涉及CN12，14，15和16多面体，这两个结构中的高阶结构是根据从体心立方结构到它们的固相反应中出现的亚稳状态的原子排列来确定的。由透射电子显微镜获得的实验数据清楚地表明，这两种情况都存在亚稳态：在μ情况下存在无序原子柱状态和原子柱块的短程有序状态，在R情况下存在另一种无序原子柱态和由纳米级原子柱区组成的磁畴结构状态。基于这些亚稳态的出现，我们试图确定μ和R结构中的高阶结构。结果表明，在该结构中存在与CN12多面体相关的四个高阶结构，而在R结构中存在两个结构，其中一个是作为初级结构的CN16多面体。因此，μ和R结构中这些高阶结构的存在表明，在涉及3D过渡金属的金属间化合物中，配位多面体结构应该具有晶体结构的层次，这与金属体系中共价键的形成和发展直接相关。