High-pressure x-ray diffraction of icosahedral Zr–Al–Ni–Cu–Ag quasicrystals
High-pressure x-ray diffraction of icosahedral Zr–Al–Ni–Cu–Ag quasicrystals
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DOI：
10.1063/1.1394951
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发表时间：
2001-08
影响因子：
4
通讯作者：
Jianzhong Jiang;K. Saksl;H. Rasmussen;T. Watanuki;N. Ishimatsu;O. Shimomara
中科院分区：
文献类型：
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作者：
Jianzhong Jiang;K. Saksl;H. Rasmussen;T. Watanuki;N. Ishimatsu;O. Shimomara
采用同步辐射高压角色散X射线粉末原位衍射法，在室温下研究了压力对由过冷液相区为44K的Zr65Al7.5Ni10Cu7.5Ag10金属玻璃形成的二十面体结构稳定性的影响。二十面体准晶结构可保持到所用的最高静水压力(约28 Gpa)，并且在减压后是可逆的。二十面体Zr-Al-Ni-Cu-Ag准晶的零压体弹性系数和压力导数分别为99.10±1.26 Gpa和4.25±0.16。各Bragg峰的压缩行为是各向同性的，各峰的半高宽在压缩过程中几乎保持不变，表明在压力作用下，二十面体的Zr-Al-Ni-Cu-Ag准晶没有各向异性的弹性，也没有缺陷。
The effect of pressure on the structural stability of icosahedral Zr–Al–Ni–Cu–Ag quasicrystals forming from a Zr65Al7.5Ni10Cu7.5Ag10 metallic glass with a supercooled liquid region of 44 K has been investigated by in situ high-pressure angle-dispersive x-ray powder diffraction at ambient temperature using synchrotron radiation. The icosahedral quasicrystal structure is retained up to the highest hydrostatic pressure used (approximately 28 GPa) and is reversible after decompression. The bulk modulus at zero pressure and its pressure derivative of the icosahedral Zr–Al–Ni–Cu–Ag quasicrystal are 99.10±1.26 GPa and 4.25±0.16, respectively. The compression behavior of different Bragg peaks is isotropic and the full width at half maximum of each peak remains almost unchanged during compression, indicating no anisotropic elasticity and no defects in the icosahedral Zr–Al–Ni–Cu–Ag quasicrystals induced by pressure.