The diffusivity of O (table 113), and the migration energy of O ions (table 114), were deduced from the creep response which followed a sudden increase in temperature. It was concluded that a change in O vacancy concentration was directly linked to the diffusion of Ni vacancies to, or from, the surface.

M.Jiménez-Melendo, A.Dominguez-Rodriguez, J.Castaing: Journal of the Physics and Chemistry of Solids, 1991, 52[3], 517-21

 

 

 

Table 113

Diffusivity of O in NiO

 

Temperature (C)

Sample

D (cm2/s)

1152

monocrystalline

6 x 10-7

1167

polycrystalline

1 x 10-6

1178

polycrystalline

1 x 10-6

1213

monocrystalline

1 x 10-6

1283

monocrystalline

2 x 10-6

1344

monocrystalline

4 x 10-6

 

 

 

 

Table 114

Migration Energy of O in NiO

 

Temperature (C)

Sample

E (eV)

1152

monocrystalline

3.6

1167

polycrystalline

3.6

1178

polycrystalline

3.5

1213

monocrystalline

3.8

1283

monocrystalline

3.5

1344

monocrystalline

3.3