Research status of novel La2Mo2O9-based oxide-ion conductors

Abstract

La₂Mo₂O₉-based oxide-ion conductors have attracted more and more attention since the high ionic conductivity was reported in 2000 by Lacorre et al. in this kind of material. In this paper the recent investigation on the novel La2Mo2O9-based oxide-ion conductors is reviewed. It is focused on the structure and phase transition, oxide-ion conductivity, mechanism of oxygen vacancy diffusion, chemical stability and thermal expansion coefficient in the pure and doped La₂Mo₂O₉ samples. It is pointed out that the La₂Mo₂O₉-based oxide-ion conductors could be possibly applied in the fields such as solid oxide fuel cells, oxygen sensors and oxygen permeable membranes.

Keywords

oxide-ion conductor, La₂Mo₂O₉, phase transition, oxygen vacancy diffusion