The self-diffusivity of 54Mn in single icosahedral quasicrystals was studied by using a precision grinding technique at temperatures ranging from 870 to 1093K. It was found that the results (table 63) could be described by an Arrhenius expression of the form:
D (m2/s) = 0.00034 exp[-180.8(kJ/mol)/RT]
W.Sprengel, T.A.Lograsso, H.Nakajima: Physical Review Letters, 1996, 77[26], 5233-6
Table 62
Diffusivity of 54Mn and 59Fe in
Quasicrystalline Al70.4Pd21.2Mn8.4
| Temperature (K) |
Tracer |
D (m2/s) |
| 833.4 |
54Mn |
6.92 x 10-16 |
| 875.2 |
54Mn |
3.30 x 10-15 |
| 930.2 |
54Mn |
1.43 x 10-14 |
| 976.2 |
54Mn |
4.81 x 10-14 |
| 1071.7 |
54Mn |
3.50 x 10-13 |
| 1122.7 |
54Mn |
9.98 x 10-13 |
| 833.3 |
59Fe |
2.79 x 10-18 |
| 920.2 |
59Fe |
6.65 x 10-17 |
| 1023.7 |
59Fe |
2.60 x 10-15 |
| 1025.2 |
59Fe |
2.07 x 10-15 |
| 1073.2 |
59Fe |
8.95 x 10-15 |
| 1074.2 |
59Fe |
1.15 x 10-14 |
| 1107.2 |
59Fe |
1.98 x 10-14 |
| 1132.2 |
59Fe |
3.64 x 10-14 |
Table 63
Diffusivity of Mn in Al70Pd21.5Mn8.5
| Temperature (K) |
D (m2/s) |
| 1093 |
7.71 x 10-13 |
| 1022 |
1.77 x 10-13 |
| 972 |
6.81 x 10-14 |
| 923 |
2.10 x 10-14 |
| 870 |
4.31 x 10-15 |