Synthesis and Study of Electrical Transport Properties of Rare Earth Polytungstates M10W22O81 (M = La, Nd)

The polytungstates of rare earth elements M10W22O81 (M = La, Nd, Ce) were synthesized by a solid-phase method; their thermal and electrical-transport properties were studied. The electrical conductivity depending on the temperature and oxygen pressure in the gas phase was measured by the electrochemical impedance method. A combination of three methods (the measurements of electrical conductivity as a function of oxygen pressure, the transport number measurements by the EMF method, and the Tubandt method) showed the studied polytungstates to be oxygen-ion conductors.