Light-scattering techniques showed that the diffusion of Ba2+ in crystals, at temperatures ranging from 690 to 760C, could be described by:

D (cm2/s) = 0.26 exp[-1.2(eV)/kT]

The bond energy of Ba plus cation-vacancy dipoles was determined to be 0.4eV. The diffusion of Ba proceeded via a dipole mechanism. V.G.Kononenko, W.Heichler: Ukr. Fiz. Zh., 1977, 22[12], 1998-2002

 

Table 60

Effect of Temperature and Pressure upon the

Self-Diffusion of 36Cl in Single Crystals of KCl

 

Temperature (C)

Pressure (kbar)

D (cm2/s)

745

1

4.80 x 10-10

744

6.9

1.46 x 10-10

743

8.2

1.73 x 10-10

745

12.0

9.57 x 10-11

747

16.5

4.53 x 10-11

685

1

1.78 x 10-10

685

10.3

3.22 x 10-11

685

10.3

3.59 x 10-11

688

16.1

1.62 x 10-11

688

17.1

1.20 x 10-11

796

10.85

1.73 x 10-10

797

12.0

1.11 x 10-10

797

13.7

1.39 x 10-10

797

13.7

1.41 x 10-10

799

16.0

1.41 x 10-10

799

16.0

1.40 x 10-10

797

17.0

1.75 x 10-10