The diffusion of H and the thermal decomposition of hydrides were investigated at high temperatures in alloys with compositions of 5 or 9%Ce. It was found that the H diffusion coefficient for obeyed an Arrhenius-type law:

Pd95Ce5:     D(m2/s) = 2 x 10-7exp[-0.20(eV)/kT]

Pd91Ce9:     D(m2/s) = 2 x 10-7exp[-0.24(eV)/kT]

The high-temperature absorption data matched low-temperature data deduced from internal friction measurements, indicating that Ce atoms did not act as strong trapping centres for H. Thermal decomposition of hydrides in the Pd95Ce5H0.008 alloy occurred in a single stage, indicating an homogeneous solid solution state of the H-Me system.

Long-Range Diffusion of Hydrogen in Solid-Solution PdCe Alloys as Deduced from Absorption Experiments. G.Mazzolai: Defect and Diffusion Forum, 2008, 273-276, 381-7