Phonon-phason coupling in decagonal quasicrystals
Phonon-phason coupling in decagonal quasicrystals
复制标题
DOI：
10.1080/14786430701264178
复制
发表时间：
2007-01-01
影响因子：
1.6
通讯作者：
Edagawa, K.
中科院分区：
文献类型：
--
作者：
Edagawa, K.
本文用晶体近似体中的声子应变讨论了十次对称准晶中的声子-相子耦合。弹性的十次对称准晶可以分为两类，一类只有一个独立的耦合常数K-4，而另一类则有两个独立的耦合常数K-4和K-5。已经表明，在各种合金系统中形成的正交和单斜近似物可以解释为来自两种不同类型的十次准晶，并且单斜相的晶胞中的轻微变形可归因于耦合常数之一K-5的影响。本文从Al-Co系单斜近似体的晶格常数出发，计算了它们的声子应变，并计算了耦合常数K ~（-4）和K ~（-5）。
Phonon-phason coupling in decagonal quasicrystals has been discussed in terms of phonon strains induced in crystal approximants. Elastically, decagonal quasicrystals can be classified into two groups having different symmetries in the coupling constant tensor; one has only one independent coupling constant, K-4, and the other has two such constants, K-4 and K-5. It has been shown that the orthorhombic and monoclinic approximants formed in various alloy systems can be interpreted as resulting from the two different types of decagonal quasicrystals and that a slight distortion in the unit cell of the monoclinic phases is attributable to the effect of one of the coupling constants, K-5. Phonon strains induced in monoclinic approximants of the Al-Co system have been calculated from their lattice constants and the coupling constants K-4 and K-5 have been evaluated.