The bulk diffusion of 51Cr in single crystals of α-type material, parallel and perpendicular to the c-axis, was determined by using the thin-film method at 750 to 848C. It was found that the diffusivity was more rapid in the c-axis direction:

parallel:     D (cm2/s) = 2 x 10-1 exp[-36.4(kcal/mol)/RT]

perpendicular:     D (cm2/s) = 2 x 10-1 exp[-38.8(kcal/mol)/RT]

with an anisotropy factor of about 3.

S.N.Balart, N.Varela, R.H.De Tendler: Journal of Nuclear Materials, 1983, 119[1], 59-66

The best linear fits to the solute diffusion data ([1305] to [1309], [1313] to [1314], [1317] to [1318], [1322] to [1325], [1332] to [1334]) yield:

Cr: Ln[Do] = 0.55E – 22.7 (R2 = 0.82); H: Ln[Do] = 0.17E – 8.2 (R2 = 0.32);

Mn: Ln[Do] = 0.27E – 14 (R2 = 0.97); O: Ln[Do] = 0.29E – 14.4 (R2 = 0.37);

Zr: Ln[Do] = 0.34E – 18.9 (R2 = 0.999)