Synthesis and study of electric transport properties of REE polytungstates M10W22O81 (M–La, Nd)

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Abstract

The M10W22O81 (M–La, Nd, Ce) polytungstates of rare earth elements were synthesized by the solid-phase method and their electrical transport and thermal properties were studied. The electrical conductivity was measured by the electrochemical impedance method depending on the temperature and oxygen pressure in the gas phase. A combination of three methods (electrical conductivity versus oxygen pressure, transport numbers by the EMF method and the Tubandt method) established that the studied polytungstates are oxygen-ion conductors.

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About the authors

N. N. Pestereva

El’tsyn Ural Federal University

Author for correspondence.
Email: Natalie.Pestereva@urfu.ru
Russian Federation, Yekaterinburg

A. F. Guseva

El’tsyn Ural Federal University

Email: Natalie.Pestereva@urfu.ru
Russian Federation, Yekaterinburg

A. A. Tushkova

El’tsyn Ural Federal University

Email: Natalie.Pestereva@urfu.ru
Russian Federation, Yekaterinburg

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Supplementary files

Supplementary Files
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2. Fig. 1. X-ray phase analysis data for La10W22O81 (а) and Nd10W22O81 (b).

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3. Fig. 2. TG-DSC results: La10W22O81 (a), Nd10W22O81 (b).

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4. Fig. 3. Impedance plots of La10W22O81 (а) at different temperatures and equivalent circuit.

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5. Fig. 4. Temperature dependences of electrical conductivity of La10W22O81 (1) and Nd10W22O81 (2).

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6. Fig. 5. Dependence of the conductivity of La10W22O81 and Nd10W22O81 on the oxygen pressure in the gas phase at different temperatures.

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7. Fig. 6. Temperature dependence of the sum of ionic transfer numbers of La10W22O81 (1) and Nd10W22O81 (2) (EMF method).

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8. Fig. 7. Diagrams of changes in the mass of La10W22O81 briquettes, t = 850°C, Q ≈ 90 Cl.

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Note

2 Based on the materials of the report at the 17th International Meeting “Fundamental and applied problems of solid state ionics”, Chernogolovka, June 16–23, 2024.


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