The O diffusivity was deduced from emf measurements performed on solid electrolytic cells at 873 to 1373K. The O diffusivity in the pure metal was independent of the O content. The diffusion parameters were ln[Do(m2/s)] = -13.72 and E = 115.5kJ/mol.

J.S.Lee, C.J.Altstetter: Acta Metallurgica, 1986, 34[1], 131-8