ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 35, Number 6
JKCSEZ 35(6)
December 20, 1991 

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 700~1100℃ under oxygen partial pressure of 2.0 × 10-1 ~ 1.0 × 10-5 atm. The electrical conductivities of the system decreased with increasing PbO mol% and varied from 10-5 to 10-1 ohm-1cm-1. 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.