OXIDE-ION CONDUCTION IN THE SM-SUBSTITUTED PBWO4 PHASES

The ionic conductivity of substituted PbWO4 phase was investigated by electrochemical methods. A substitution method by samarium, as shown i n Pb1-xSmxWO4+x/2, to intend to increase the concentration of intersti tial oxide ions enhanced the ionic conductivity. The charge carrier in the substituted phase was the oxide ion. The conductivity behavior du e to the oxide ion was almost the same as the previously reported La-s ubstituted phase. The relation between the conductivity and the crysta l parameters in the substituted phases were also discussed.