The chemical diffusion coefficient in pure and Li-doped cobaltous oxide were deduced from electrical conductivity measurements, performed during equilibration of the gas-

oxide system, at 1000 to 1400C, under O partial pressures higher than 10-5atm. The results obtained for the pure Co1-xO single crystals exhibited a small decrease in the chemical diffusion coefficient with O partial pressure. In air, their variation with temperature could be expressed by:

D (cm2/s) = 1.3 x 10-1 exp[-30.0(kcal/mol)/RT]

In air, the variation in the chemical diffusion coefficient with temperature could be described by:

D (cm2/s) = 1.4 x 10-2 exp[-27.0(kcal/mol)/RT]

Chemical Diffusion Coefficient Measurements in Pure and Lithium Doped Cobaltous Oxide. G.Petot-Ervas, O.Radji, B.Sossa, P.Ochin: Radiation Effects and Defects in Solids, 1983, 75[1], 301-8

Table 48

Mn Diffusion in (CoyFe1-y)O as a Function of O Activity

Coefficients in the Equation:

Log[D(cm2/s)] = AaO23 + BaO22 + CaO2 + D