Permeation measurements under open-circuit and short-circuit conditions combined with cell-voltage measurements and two probe alternating-current impedance spectroscopy measurements were carried out in order to verify the conduction properties of La2Mo2O9 that recently was considered a good O ion conductor. As a result, a densified sample of La2Mo2O9 exhibited conductivity values nearly three orders of magnitude lower than those reported in literature. According to these findings, La2Mo2O9 did not satisfy any criterion for a useful oxide solid electrolyte.

On the Electronic and Ionic Transport Properties of La2Mo2O9. R.Subasri, H.Näfe, F.Aldinger: Materials Research Bulletin, 2003, 38[15], 1965-77