Novel intermetallic hydrides
Novel intermetallic hydrides
复制标题
DOI：
10.1016/j.jallcom.2005.04.190
复制
发表时间：
2006-02
影响因子：
6.2
通讯作者：
V. Yartys;A. B. Riabov;R. Denys;M. Sato;R. Delaplane
中科院分区：
文献类型：
--
作者：
V. Yartys;A. B. Riabov;R. Denys;M. Sato;R. Delaplane
本文主要研究具有特殊结构性质的新型金属间化合物的结构化学。在这样的“各向异性”介质中，在单一的晶体学方向上进行巨大的膨胀，并导致沿着膨胀方向和垂直于膨胀方向的金属间化合物的性质的显著差异。“各向异性”金属间化合物的行为由金属-氢和氢-氢相互作用主导，与“常规”金属间化合物相反，在“常规”金属间化合物中，金属-氢和氢-氢相互作用是金属间化合物的主要特征。金属相互作用是最重要的。与已知的金属间化合物的晶体结构形成鲜明对比的是，在“各向异性”的氘原子中，氘原子并不填充最初存在的空隙，而是将稀土原子吸引到它们的周围并形成新的D-占据位点。本文将总结我们最近对“各向异性”材料的研究，特别关注两组材料：（a）RENiIn基氘化物（RE=稀土金属），在金属Ni结构中含有最短的已知氢原子间隔，和（B）RENi 3-（CeNi 3）和RE 2 Ni 7-（La 2 Ni 7）基氘化物，其产生异常大的（59-63%）组成RENi 2层的膨胀。
The paper focuses on structural chemistry of novel intermetallic hydrides with unusual structural properties. In such “anisotropic” hydrides, a huge expansion proceeds in a sole crystallographic direction and leads to a dramatic differentiation of the properties of the hydrides along the direction of the expansion and normal to it. The behaviour of the “anisotropic” hydrides is dominated by the metal–hydrogen and hydrogen–hydrogen interactions in contrast to the “conventional” intermetallic hydrides where the metal–metal interactions are the most important ones. In sharp contrast to the known crystal structures of intermetallic hydrides, in “anisotropic” hydrides deuterium atoms do not fill initially existing interstices but, instead, attract rare earth atoms into their surrounding and form new D-occupied sites. This paper will summarise our recent research on the “anisotropic” hydrides with a particular focus on two groups of materials: (a) RENiIn-based deuterides (RE=rare earth metal) containing the shortest known separation of hydrogen atoms in the structures of metal hydrides and (b) RENi3–(CeNi3) and RE2Ni7–(La2Ni7)-based deuterides which develop unusually large (59–63%) expansion of the constituent RENi2layers.