A Study on New Orthorhombic Approximants of the Al70Co15Tb5Ni10 Decagonal Quasi-crystal
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摘要: 使用静高压熔态淬火方法，在Al70Co15Tb5Ni10合金中截获到迄今为止晶胞参数最大的两个十次准晶的Penrose-Tiling相关相。其晶胞参数分别为：简单正交晶体a=6.11 nm，b=0.4 nm，c=8.4 nm；底心正交晶体a=6.11 nm，b=0.4 nm，c=8.4 nm。其晶体结构和晶胞参数与目前理论上的预言基本吻合。
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关键词:
- 准晶相关相 /
- AlCoTbNi合金 /
- 静高压 /
- 熔态淬火
Abstract: Two new orthorhombic approximants with the largest until cell observed up to now were found in the Al70Co15Tb5Ni10 decagonal quasi-crystal, which were prepared by quenching (102 ℃/s) the melt state (1 700 ℃) under high static pressure (7.0 GPa). The lattice parameters of the orthorhombic approximant are the same (a=6.1 nm, b=0.4 nm, c=8.4 nm), but the structure of the first phase is P-type and that of the second phase is a B-type. Their structures and lattice parameters are in accordance with that of the present theoretical predictions. -
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