High-pressure x-ray diffraction of icosahedral Zr–Al–Ni–Cu–Ag quasicrystals

Jiang, J. Z.; Saksl, K.; Rasmussen, H.; Watanuki, T.; Ishimatsu, N.; Shimomara, O.
August 2001
Applied Physics Letters;8/20/2001, Vol. 79 Issue 8, p1112
Academic Journal
The effect of pressure on the structural stability of icosahedral Zr–Al–Ni–Cu–Ag quasicrystals forming from a Zr[sub 65]Al[sub 7.5]Ni[sub 10]Cu[sub 7.5]Ag[sub 10] 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. © 2001 American Institute of Physics.


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