Abstract
Stability of an Al 70Pd 19Os 11 1/0 approximant under high pressures up to 70 GPa have been investigated by means of an in situ angular-dispersive X-ray diffraction method using synchrotron radiation and a diamond anvil cell. Pressure dependence of X-ray powder diffraction patterns showed no drastic change. Pressure dependence of individual d-spacing ( d) showed a continuous decrease with applying pressure. These results are highly different from the reported results for Al 5Li 3Cu 1/1 approximant which showed a pressure-induced amorphization at about 20 GPa. Pressure dependence of d/ d 0, where d 0 is d-spacing at ambient pressure showed isotropic compression behavior. It should be noted that pressure dependence of d, d/ d 0 and V/ V 0, where V is volume and V 0 is volume at ambient pressure, showed a dull change around 30 GPa. This suggested a local transition of atomic configuration.
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