Icosahedral quasicrystals in Zn–T–Sc (T = Mn, Fe, Co or Ni) alloys
Icosahedral quasicrystals in Zn–T–Sc (T = Mn, Fe, Co or Ni) alloys
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DOI：
10.1080/09500830410001664544
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发表时间：
2003-08
影响因子：
1.2
通讯作者：
Ryo Maezawa;S. Kashimoto;T. Ishimasa
中科院分区：
文献类型：
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作者：
Ryo Maezawa;S. Kashimoto;T. Ishimasa
从Zn_（17）Sc_3立方近似体出发，用过渡元素T取代Zn，寻找新的准晶合金。当T = Mn，Fe，Co，Ni时，合金成分为Zn_（75）T_（10）Sc_（15）的铸态合金中形成了新的二十面体准晶作为主相。所有这些准晶都属于原始类型，并且具有6D的六维晶格参数a6 D范围为7.044至7.107 μ m。它们的价电子浓度e/a在2.01 ~ 2.14之间，彭罗斯瓦片的边长a R与平均原子直径之比几乎相同。此外，其他Zn基和Cd基准晶，包括相同类型的原子蔡型簇，具有相同的e/a = 2.1和。e/a的相等表明Hume-Rothery机制在这些准晶的形成中起着重要作用。
Starting from the Zn17Sc3 cubic approximant, new quasicrystal alloys were sought by replacement of Zn with transition elements T. In the cases when T = Mn, Fe, Co and Ni, new icosahedral quasicrystals are formed in as-cast alloys as major phases at alloy compositions of Zn75T10Sc15. All these quasicrystals belong to a primitive type and have six-dimensional lattice parameters a 6D ranging from 7.044 to 7.107 Å. They have valence electron concentrations e/a ranging from 2.01 to 2.14, and almost the same ratios between the edge length a R of the Penrose tile and the averaged atomic diameter . Moreover other Zn- and Cd-based quasicrystals, including the same type of atomic Tsai–type cluster, have the same values of e/a ≈ 2.1 and . The equality in e/a indicates that the Hume-Rothery mechanism plays an important role for the formation of these quasicrystals.