The migration of Be in monocrystalline samples was studied, at temperatures of between 583 and 800K, by using sputter-sectioning and secondary ion mass spectroscopy techniques. It was found that the diffusivity (table 40) obeyed an Arrhenius-type equation. The results could be described in terms of an electrostatic model for impurity diffusion in noble metals, assuming that the Be behaved like a divalent metal. A slight curvature of the Arrhenius plot was attributed to a contribution which was made by divacancies.

A.Almazouzi, M.P.Macht, V.Naundorf, G.Neumann: Physica Status Solidi A, 1992, 133[2], 305-15

 

Table 38

Diffusivity Parameters for 195Au in Cu

 

Tilt Angle (º)

Temperature (K)

sδDo (m3/s)

E (kJ/mol)

33.21

661-872

2.1 x 10-15

72.9

35.10

661-780

3.9 x 10-15

73.8

35.19

661-780

4.9 x 10-16

60.2

35.88

661-872

9.0 x 10-16

63.9

36.00

661-868

1.3 x 10-15

67.5

36.26

661-872

6.9 x 10-15

80.3

36.53

661-872

1.2 x 10-14

87.3

36.67

661-872

7.3 x 10-16

61.9

37.57

661-1030

5.0 x 10-17

43.2

37.74

661-780

9.6 x 10-17

45.3

38.12

661-872

2.5 x 10-16

54.3

39.26

661-780

2.0 x 10-15

68.5