X-ray absorption and diffraction spectroscopy of icosahedral Al-Cu-Fe quasicrystals under high pressure
X-ray absorption and diffraction spectroscopy of icosahedral Al-Cu-Fe quasicrystals under high pressure
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高压下二十面体Al-Cu-Fe准晶的X射线吸收和衍射光谱
DOI：
10.1080/01418639408240256
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Y. Calvayrac
中科院分区：
文献类型：
--
作者：
A. Sadoc;J. P. Iité;A. Polian;S. Lefébvre;M. Bessière;Y. Calvayrac
本文报道了准晶在高压准静水条件下的原位扩展X射线吸收精细结构(EXAFS)和X射线衍射研究。首次将EXAFS和衍射实验相结合，给出了原子的近程和长程有序随压力的联合演化。对二十面体Al62Cu25.5Fe12.5合金进行了Fe和CuK吸收边的EXAFS实验，实验范围从常压到约8 Gpa(Fe边)或35 Gpa(Cu边)。由此得到了Fe原子和Cu原子周围的局域有序度作为压力的函数。获得了相同准晶的X射线衍射图，最高可达35 Gpa，并给出了6D晶格参数随压力的变化。一个值得注意的结果是，准晶在最高压力下仍保持二十面体。6D晶格参数和第一近邻距离的演化提供了零压力体模及其第一近邻距离的值。
Abstract We report in-situ extended X-ray absorption fine structure (EXAFS) and X-ray diffraction studies of quasicrystals under high pressure quasihydrostatic conditions. The EXAFS and diffraction experiments are combined for the first time to give a joint evolution of the short-range and long-range atomic order with pressure. EXAFS experiments performed at the Fe and Cu K absorption edges have been carried out for an icosahedral Al62Cu25.5Fe12.5 alloy from ambient pressure up to about 8 GPa (Fe edge) or 35 GPa (Cu edge). The local order around Fe and Cu atoms has thus been obtained as a function of pressure. X-ray diffraction patterns have been obtained for the same quasicrystal up to 35 GPa and these have given a variation in the 6D lattice parameter with pressure. A remarkable result is that the quasicrystal remains icosahedral up to the highest pressure. The evolution of the 6D lattice parameter and of the first-neighbour distances has provided values of the zero-pressure bulk modulus and of its firs...