Composition-dependent electrical resistivity in an Al-Re-Si 1 /1-cubic approximant phase: an indication of electron confinement in clusters.
Composition-dependent electrical resistivity in an Al-Re-Si 1 /1-cubic approximant phase: an indication of electron confinement in clusters.
复制标题
Al-Re-Si 1 /1 立方近似相中与成分相关的电阻率：团簇中电子限制的指示。
DOI：
10.17877/de290r-6992
复制
发表时间：
2001
影响因子：
8.6
通讯作者：
S. Takeuchi
中科院分区：
文献类型：
--
作者：
R. Tamura;T. Asao;S. Takeuchi
我们报道了α-AlReSi的合成，并表明它是二十面体准晶的1/1立方近似相，a = 12.9 A。新近似相的电阻率趋势显示出非金属特征，与稳定二十面体相中的电阻率趋势相似。电阻率敏感地取决于 Re 浓度，并且仅在 Re 浓度接近 17.4 at 时才观察到非金属传输。 %，其中二十面体簇中的过渡金属位点完全被Re原子占据。鉴于最近的从头计算，目前的结果强烈表明在过渡金属原子的二十面体簇中形成了虚拟束缚态或电子限制。
We report the synthesis of alpha-AlReSi and show that it is a 1/1-cubic approximant phase of the icosahedral quasicrystal with a = 12.9 A. The trend of the resistivity of the new approximant phase shows a nonmetallic character, similar to those seen in the stable icosahedral phases. The resistivity depends sensitively on the Re concentration and the nonmetallic transport is observed only at the Re concentration close to 17.4 at. %, where the transition metal sites in the icosahedral cluster are exclusively occupied by Re atoms. In view of a recent ab initio calculation, the present result suggests strongly the formation of the virtual bound states, or confinement of electrons, in the icosahedral clusters of transition metal atoms.