Determination of structural vacancy densities in icosahedral quasicrystals by slow positron beam technique

Sato K; Uchiyama H; Takahashi Y; Kanazawa I; Tamura R; Kimura K; Komori F; Suzuki R; Ohdaira T; Takeuchi S

Materials Science Forum, Vol.363-3, 481-483, 2001

Sato K, Uchiyama H, Takahashi Y, Kanazawa I, Tamura R, Kimura K, Komori F, Suzuki R, Ohdaira T, Takeuchi S

Icosahedral quasicrystals Al71.5Pd20.3Mn8.2, Al70.7Pd21.34Re7.96, Al62.5Cu25.5Fe12.5, and alpha -Al69.31Mn21.21Si10.48 1/1- approximant were investigated using a slow positron beam. The structural vacancy densities in the first three samples were determined to be 5.0x10(20), 7.7x10(20), and 4.7x10(20) cm(-3), respectively, by analyzing the measured S-parameter.

Keywords:quasicrystal;slow positron beam;structural vacancy density