An oxygen transport ceramic membrane was prepared with La0.6Sr0.4TixFe1−xO3−δ (x

= 0.2 and 0.3) oxides which was synthesized by polymerized complex method. In

order to investigate the effects of Ti substitutions into lanthanum–strontium

ferrites, material property, thermal expansion coefficient, oxygen permeation,

electrical conductivity and phase stability were examined according to Ti contents.

The thermal expansion coefficients of LSTF6428 and LSTF6437 were 25.76 x 10−6

and 21.32 x 10−6/K, respectively, at 973 to 1273K. The oxygen permeation fluxes through a disk-type dense membrane of LSTF6428 and LSTF6437 with 1.6mm

thickness increased exponentially with increasing temperature and were 0.17 and

0.13ml/cm2min with Ph = 0.21atm (O2-rich side) and Pl = 10−5atm (lean side) at

1223K, respectively. In the result of phase stability test with various conditions

such as He, H2/N2 and CO2 atmosphere, La0.6Sr0.4TixFe1−xO3−δ was confirmed to be

more stable than La0.6Sr0.4Ti0.2Fe0.8O3−δ.

Oxygen Permeation and Stability of La0.6Sr0.4TixFe1−xO3−δ (x = 0.2 and 0.3)

Membrane. J.H.Park, K.Y.Kim, S.D.Park: Desalination, 2009, 245[1-3], 559-69