Interpretation of high electrical resistivity behavior based on the structure determination of the Al–Cu–(Fe,Ru)–Si 1/1-cubic approximants
Interpretation of high electrical resistivity behavior based on the structure determination of the Al–Cu–(Fe,Ru)–Si 1/1-cubic approximants
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基于 Al-Cu-(Fe,Ru)-Si 1/1-立方近似的结构测定对高电阻率行为的解释
DOI：
10.1016/s0925-8388(02)00268-2
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发表时间：
2002
影响因子：
6.2
通讯作者：
U. Mizutani
中科院分区：
文献类型：
--
作者：
T. Takeuchi;U. Mizutani
采用Rietveld方法对同步辐射粉末衍射光谱进行分析，确定了Mackay二十面体Al-Cu - (Fe,Ru) - si 1/1立方近似体的局部原子结构。我们发现这些1/1立方近似涉及化学和结构紊乱，并且它们的电阻率大小的差异可以通过考虑化学和结构紊乱程度的差异来解释。无序性最强的al54cu25.5 ru12.5 si81 /1立方近似物的电阻率最大，与al63cu25ru12准晶的电阻率相当。我们得出结论，原子排列的无序程度比准周期性在决定准晶体及其1/1立方近似物的电阻率大小方面起着更关键的作用。
The local atomic structure of Mackay icosahedral-type Al–Cu–(Fe,Ru)–Si 1/1-cubic approximants was determined by applying the Rietveld method to the powder diffraction spectra taken with synchrotron radiation. We found that these 1/1-cubic approximants involve chemical and structural disorders and that the difference in the magnitude of their electrical resistivities can be explained by taking into account the difference in the degree of chemical and structural disorder. The electrical resistivity of the Al54Cu25.5Ru12.5Si81/1-cubic approximant characterized by the possession of the strongest disorder is found to be the largest among the samples studied and to be comparable to that of the corresponding Al63Cu25Ru12quasicrystal. We conclude that the degree of disorder involved in the atomic arrangements plays a more crucial role than the quasi-periodicity in determining the magnitude of the electrical resistivity in both quasicrystals and their 1/1-cubic approximants.