Singh A, Abe E, Takakura H, Tsai AP
National Research Institute for Metals, Tsukuba, Japan.
Micron. 2000 Oct;31(5):499-505. doi: 10.1016/s0968-4328(99)00130-4.
A number of hexagonal phases with inflated/deflated a lattice parameters but equal c parameters are found to exist with compositions close to that of the icosahedral phase. Surprisingly, no cubic or orthorhombic approximants are found. The closeness of the hexagonal phases to the icosahedral phase is shown through the electron diffraction features. Through stereographic analysis of the hexagonal phases it is shown that they consist of three icosahedral units rotated by 120 degrees about a common twofold axis, forming the sixfold axis. It is suggested that this phase falls into a class of crystals closely related to both the icosahedral and decagonal quasicrystals, but are not approximants to them. These phases can instead be considered to be approximant to the hexagonal quasicrystal.
发现存在一些六方相，其a晶格参数膨胀/收缩但c参数相等，成分接近二十面体相。令人惊讶的是，未发现立方或正交近似相。通过电子衍射特征表明六方相与二十面体相接近。通过对六方相的球极投影分析表明，它们由三个二十面体单元围绕共同的二重轴旋转120度组成，形成六重轴。有人认为，该相属于一类与二十面体和十边形准晶体密切相关但并非它们近似相的晶体。相反，这些相可被视为六方准晶体的近似相。
Zotero 插件