The total electrical conductivities were studied for the solid solutions in the pseudo-binary system CeO2La6WO12. Maximum conductivities were observed at about 90 mol.% CeO2, 1.1 ohm-1 cm-1 at 1500°C and 4.4 × 10-3 ohm-1 at 600°C. A minimum point was observed in conductivity isotherms at about 10 mol.% CeO2. A pyrochlore like stoichiometric compound La2 (LaCe 1 2 W 1 2)O7 was assumed. The crystal structure of La6WO12 is discussed. Ionic conductions were observed at low temperatures.
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