Charge carriers and dc polarization phenomena in solid Na2WO4

Abstract

Ionic transport measurements based on the Tubandt method have been performed in all three solid phases of Na2WO4 at temperatures between 550 and 600°C in air. It is shown that tNa+ = 1.00 in all cases. Ag is oxidized anodically to Ag+ at Ag/Na2WO4 interfaces. Cathodically only (air) oxygen reduction occurs, resulting in the formation of a poorly conducting layer of Na2O and Na2CO3 at the cathode.