Conductivity Dependence on Oxygen Partial Pressure and Oxide-Ion Transport Numbers Determination for La[sub 2]Mo[sub 2]O[sub 9]

Transport number measurements and impedance spectroscopy in controlled temperature and atmosphere were used to investigate the electrical conduction properties of The compound is a pure oxygen ion conductor in the temperature range of 400-800°C with oxide ion transport numbers greater than 0.99. The effect of the oxygen partial pressure on the electrical conductivity of was investigated from 1 to atm, showing that the material is stable and mainly an ionic conductor down atm at 800°C. These results confirm the suitability of the recently discovered -based compounds as electrolytes in solid oxide fuel cell applications. © 2004 The Electrochemical Society. All rights reserved.