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首页> 外文期刊>Philosophical Magazine Letters >Stable Cd-Mg-Yb, and Cd-Mg-Ca icosahedral quasicrystals with wide composition ranges
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Stable Cd-Mg-Yb, and Cd-Mg-Ca icosahedral quasicrystals with wide composition ranges

机译：具有宽组成范围的稳定Cd-Mg-Yb和Cd-Mg-Ca二十面体准晶体

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Stable icosahedral quasicrystals with wide composition ranges have been found in the systems Cd-Mg-Yb and Cd-Mg-Ca. The icosahedral quasicrystals form in the following composition ranges: 25-85 at. percent Cd. 0-60 at. percent Mg and 10-20 at. percent Yb for the Cd-Mg-Yb system; 33-85 at. percent Cd. 0-52 at. percent Mg and 10-20 at. percent Ca for the Cd-Mg-Ca system. An electron diffraction study confirmed that the icosahedral quasicrystals have a primitive lattice. Its quasilattice constant is proportional to a Goldschmidt atom diameter of the quasicrystals weighted by a factor of 1.75 in the range 0.5681-0.5799 nm for the Cd-Mg-Yb system and 0.5697-0.5778 nm for the Cd-Mg-Ca system. The closely similar atom sizes of Cd and Mg, the valence electron ratio e/a = 2.0 and the large atom sizes of Yb and Ca cause the wide composition ranges of the Cd-Mg-Yb and Cd-Mg-Ca quasicrystals. The metallurgical behaviour of the quasicrystals is discussed.
机译：在Cd-Mg-Yb和Cd-Mg-Ca系统中发现了具有宽组成范围的稳定的二十面体准晶体。二十面体准晶体的形成范围如下：25-85 at.。镉百分比0-60 at。镁百分比和10-20 at。 Cd-Mg-Yb系统的Yb百分比; 33-85在。镉百分比0-52 at。镁百分比和10-20 at。 Cd-Mg-Ca系统的Ca百分比。电子衍射研究证实，二十面体准晶体具有原始晶格。对于Cd-Mg-Yb系统，其准硅常数与准晶体的Goldschmidt原子直径的权重为1.75，范围为0.5681-0.5799 nm，对于Cd-Mg-Ca系统为0.5697-0.5778 nm。 Cd和Mg的原子尺寸非常相似，价电子比e / a = 2.0，Yb和Ca的原子尺寸较大，导致Cd-Mg-Yb和Cd-Mg-Ca准晶体的宽组成范围。讨论了准晶体的冶金行为。

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