The diffusion of U was characterized by Rutherford back-scattering spectrometry. Experiments performed at 1000 to 1300C yielded an Arrhenius relationship for diffusion parallel to the c-axis:

D(m2/s) = 1.3 x 10-6 exp[-394(kJ/mol)/RT]

The diffusion coefficients for transport normal to c were quite similar to those parallel to c.

D.J.Cherniak: Chemical Geology, 2005, 219[1-4], 297-308