Cs. Chen et al., MICROSTRUCTURAL DEVELOPMENT, ELECTRICAL-PROPERTIES AND OXYGEN PERMEATION OF ZIRCONIA-PALLADIUM COMPOSITES, Solid state ionics, 76(1-2), 1995, pp. 23-28
Yttria-stabilized cubic zirconia (YSZ)-palladium dual phase composites
have been investigated. The percolative composite containing 40 vol%
Pd (ZYPd40) showed a much larger oxygen permeability than that of the
non-percolative composite containing 30 vol% Pd (ZYPd30). For a 2.0 mm
thick percolative composite, an oxygen flux of 4.3 X 10(-8) mol/cm(2)
/s was measured at 1100 degrees C with oxygen partial pressures at the
feed and permeate sides being 0.209 and 0.014 atm, respectively. This
value is two orders of magnitude larger than that observed for a 2.0
mm thick non-percolative composite at the same temperature with the ox
ygen partial pressures at the feed and permeate sides being 0.209 and
1.5 X 10(-4) atm, respectively. From the dependence of the oxygen perm
eation on the temperature and on the oxygen partial pressures, it was
concluded that the transport of the oxygen ions through the YSZ phase
in the percolative system was the rate limiting step.