The permeation of O in Sr4Fe6-xCoxO13 was studied for x-values ranging from 0 to 1.8. The samples with x-values greater than 1.5 comprised the perovskite phase, SrFe1-xCoxO3, plus the spinel phase, Co3-xFexO4; in addition to the Sr4Fe6O13-type intergrowth phase. The total conductivity and the O-flux increased with increasing x-value (table 192).

Oxygen Permeation Studies of Sr4(Fe,Co)6O13. T.Armstrong, S.Guggilla, A.Manthiram: Materials Research Bulletin, 1999, 34[6], 837-44

Table 192

Conductivity of Sr4Fe6-xCoxO13 at 900C

 

x

Conductivity (S/cm)

0

0.65

0.6

2

1.2

8

1.5

10

1.8

17