Study of the Electrical Conductivity of the $({\alpha}-Nb_2O_5)_{1-x^-}(PbO)_x$ Solid Solution

The electrical conductivity of the Niobium Oxide-Lead Oxide systems containing 2.5, 5.0, 7.5, and 10.0 mol% of Lead Oxide has been measured in a temperature range 700 under oxygen partial pressure of 2.0 1.0 atm. The electrical conductivities of the system decreased with increasing PbO mol% and varied from to . The activation energy for conductivity was about 1.70 eV. The oxygen pressure dependence of electrical conductivity revealed that the system was a mixed conductor between ionic and electronic conductivities at high oxygen pressures and a n-type electronic conductivity with oxygen pressure dependence of -1/4 order at low oxygen pressures. The defect structure and electrical conduction mechanism of the system have been discussed with the data obtained.