Electrical conductivity and defect chemistry of PbMoO4 and PbWO4

Abstract

The ionic and electronic conductivities of Czochralski-grown single crystals of PbMoO4 and PbWO4 are reported and discussed. Nominally pure crystals, as well as crystals with various aliovalent dopants, were used. From the electrical measurements it is concluded that oxygen vacancies are responsible for the ionic conductivities in both compounds. At high temperatures electronic conductivity predominates. Measurements of the oxygen partial pressure dependence of the electronic conductivity reveal that hole conduction prevails in PbWO4, while mixed conduction by holes and electrons is present in PbMoO4.