ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 26, Number 3
JKCSEZ 26(3)
June 20, 1982 

The electrical conductivity of n-type polycrystalline MnOx-TiO2 system containing 0.40, 0.80, and 1.60 mol % of manganese oxide has been measured from 100 to 400℃ and 1100 to 1300℃ under oxygen partial pressures of 10-8 to 10-1 atm. Plots of log conductivity vs. reciprocals of absolute temperature at constant PO2's are found to be linear with an inflection, and the activation energies obtained from the slopes appear to be an enough average 0.18eV for the extrinsic and 3.70eV for the intrinsic. The log σ vs. log PO2 are found to be linear at PO2's of 10-8 to 10-1 atm. The conductivity dependences on PO2 at the two temperature regions are closely approximated by σ∝PO2-1/6 for the extrinsic and σ∝PO2-1/4 for the intrinsic, respectively. The predominant defects are believed to be Vo-2e' and Ti3· interstitial at the extrinsic and intrinsic. From the interpretations of conductivity dependences on temperature and PO2, the conduction mechanisms and possible band models are proposed.