Interdiffusion in the solid solutions was studied at temperatures ranging from 420 to 560C (table 272). The Boltzmann-Matano method was used to deduce the diffusivities from concentration versus penetration curves which were determined by means of sectioning and X-ray analysis. The interdiffusion coefficient was concentration-dependent and exhibited a bimodal temperature dependence.

Y.Haget, N.B.Chanh, P.Garin, L.Bonpunt: Acta Metallurgica, 1975, 23[6], 723-8

 

 

Table 272

Arrhenius Parameters for Interdiffusion in NaI-KI Solid Solutions

 

KI (mol%)

Do (cm2/s)

Q (kcal/mol)

0

0.1

28.5

5

0.3

30.8

10

0.8

32.0

15

1.3

32.7

20

3.2

34.0

25

4.7

34.5

30

4.8

34.7

35

14.7

35.9

40

19.8

36.3

45

30.7

36.8

50

25.5

36.3

55

33.7

36.8

60

42.4

37.3

65

49.2

37.7

70

28.7

36.8

75

11.3

35.4

80

5.7

34.5

85

2.1

33.1

90

0.1

29.0

95

0.03

26.7

100

0.005

22.0