Oxygen permeation in Sr- and Mg-doped LaAlO3 and Gd-doped CeO2 at high temperature

The oxygen fluxes of acceptor-doped LaAlO3 (La0.9Sr0.1Al0.9Mg0.1O3−δ, LSAM9191) and ceria (Ce0.8Gd0.2O2−δ, GDC20) were measured and compared as a function of temperature (1300–1600 °C) and oxygen partial pressure (PO2=0.21–10−9 atm). The oxygen permeation driven by PO2 gradient was measured by either gas chromatograph or oxygen sensor. The measured oxygen fluxes were compared with those estimated from the measured (GDC20) or the reported (LSAM9191) electrical conductivity [Solid State Ionics 154 (2002) 535]. The oxygen flux of GDC20 was about one order of magnitude higher than that of LSAM9191 in most PO2 gradient.