A study was made of the equilibration kinetics, of La0.8Sr0.2CoO3 at 876 to 1114K, by using a gravimetric method. The chemical diffusion which was determined in this way depended upon the O partial pressure and could be described by:

D (cm2/s) = 8.7 x 10-3 exp[-58.1(kJ/mol)/RT]

D (cm2/s) = 6.2 x 10-3 exp[-74.4(kJ/mol)/RT]

at low and high O partial pressures, respectively.

Chemical Diffusion of (La,Sr)CoO2 and (La,Sr)FeO3. N.R.Kas, T.Bak, N.Nowotny, C.C.Sorrell, Y.Zhao, K.Foger, E.R.Vance: Journal of Materials Science – Materials in Electronics, 2000, 11[9], 691-6

Table 117

Tracer Diffusion of Oxide Ions in La0.9Sr0.1CoO3

(Oxygen partial pressure = 4.5kPa)