The orientational and isotopic dependence of diffusion in LuH0.05 and LuD0.05 was studied by using Gorsky effect measurements at temperatures of between 380 and 540K. No appreciable anisotropy in the diffusion behavior was detected for monocrystalline or polycrystalline samples. Regardless of the orientation, the type of sample, and the type of isotope, the diffusivity varied from about 10-8cm2/s at 180C to about 10-9cm2/s at 120C.

Diffusion of H and D in Lutetium. J.Völkl, H.Wipf, B.J.Beaudry, K.A.Gschneidner: Physica Status Solidi B, 1987, 144[1], 315-27