K. Hariharan et J. Maier, ENHANCEMENT OF THE FLUORIDE VACANCY CONDUCTION IN PBF2-SIO2 AND PBF2-AL2O(3) COMPOSITES, Journal of the Electrochemical Society, 142(10), 1995, pp. 3469-3473
A careful analysis of the impedance spectra of PbF2:SiO2 and PbF2:Al2O
3 composites reveals that the increased conductivity of the composites
is due to enhanced fluorine ion vacancy concentration. The combinatio
n of homogeneous and heterogeneous doping is consistent with the above
finding. These results are in reasonable agreement with the ''model o
f heterogeneous doping.'' Space charge mechanisms as well as various o
ther processes that may contribute to the enhanced conductivity are di
scussed.