Conductivity dependence on oxygen partial pressure and transport number measurements of La 2 Mo 2 O 9

Transport number measurements and impedance spectroscopy in controlled temperature and atmosphere were used to investigate the electrical properties of La 2 Mo 2 O 9 sintered samples. These samples were prepared from nanocrystalline La 2 Mo 2 O 9 powders as obtained from a new soft chemistry route involving the polymerisation of acrylamide. By means of the electromotive force method measurements, the sintered compound was found mainly oxygen conductor in the range of 400 °C-800 °C with oxide-ion transport number greater than 0.99. The effect of the oxygen partial pressure on the electrical conductivity of La 2 Mo 2 O 9 was investigated by impedance spectroscopy from 1 to 10 −22 atm, showing a highly stable conduction properties up to 10 −17 atm at 800 °C.