The effects of electron irradiation upon icosahedral Al70.2Pd21.3Mn8.5 quasicrystals were investigated by making simultaneous measurements of positron lifetime and 2-detector coincident Doppler broadening spectra at room temperature. Irradiation-induced vacancies could be detected via more sensitive coincident Doppler broadening measurements of the positron-electron annihilation photon line, in addition to structural vacancies.

Vacancies in Quasicrystals - Effects of Electron Irradiation. K.Sato, F.Baier, W.Sprengel, H.E.Schaefer: Physical Review B, 2002, 66[9], 092201 (3pp)

 

 Table 2

 Diffusivity of 60Co in Al72.2Ni11.8Co16.0 (Twofold Direction)

 

 

 

Temperature (K)

Diffusivity (m2/s)

803

5.60 x 10-20

876

2.40 x 10-18

923

1.90 x 10-17

971

1.03 x 10-16

997

2.42 x 10-16

1025

7.50 x 10-16

1079

4.41 x 10-15

1144

2.69 x 10-14

1210

1.47 x 10-13