A study was made of the equilibration kinetics, of La0.72Sr0.18FeO3 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) = 3.05 x 10-5 exp[-3.3(kJ/mol)/RT]

D (cm2/s) = 6.3 x 10-3 exp[-82.7(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

Figure 21

Diffusion in La1−xSrxFeO3−δ

(Filled circles: Y3+ in LaFeO3; filled squares: Cr3+ in LaFeO3; open circles: Y3+ in La0.9Sr0.1FeO3; open squares: Cr3+ in La0.9Sr0.1FeO3)