A study was made of the release kinetics of radioactive Ar atoms from single crystals, following neutron irradiation. The results for undoped material, at 940 to 1320C, could be described by:

D (cm2/s) = 1 x 104 exp[3.0(eV)/kT]

The results for U-doped material, at 700 to 940C, could be described by:

D (cm2/s) = 1010 exp[6(eV)/kT] Diffusion of Ar, Kr, and Xe in CaF2 Investigated on U-Doped Single Crystals of CaF2 after Neutron Irradiation. F.W.Felix, S.Y.T.Lagerwall: Physica Status Solidi A, 1971, 4[1], 73-9

 

 

Table 158

Self-Diffusion of Ca in CaF2 Single Crystals

 

Temperature (C)

D (cm2/s)

987

1.15 x 10-13

987

1.18 x 10-13

1020

5.58 x 10-13

1020

4.10 x 10-13

1048

1.15 x 10-12

1063

1.16 x 10-12

1095

1.59 x 10-12

1116

5.42 x 10-12

1151

9.18 x 10-12

1182

1.15 x 10-11

1205

4.94 x 10-11

1205

5.10 x 10-11

1226

6.13 x 10-11

1246

1.18 x 10-10