Synthesis and physico-chemical properties La0.9Sr0.1Sc1 – xMnxO3 – δ ceramic materials with mixed electron and ion conductivity

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Abstract

Perovskite-like materials with mixed ionic and electronic conductivity are considered as promising functional materials for proton-ceramic electrochemical devices. In the present work, a solid solutions series La0.9Sr0.1Sc1 – xMnxO3 – δ, where B-cation position scandium ions are gradually replaced by manganese ions, was obtained and studied in first time. The obtained materials were certified by X-ray phase analysis, scanning electron microscopy, and energy-dispersive microanalysis. The dopant influence on the sinterability and morphology researched materials is shown. The solid solutions electrical conductivity as a function of temperature and gas phase humidity were investigated by direct current four-probe method.

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About the authors

O. S. Bervitskaya

Vyatka State University

Author for correspondence.
Email: usr20264@vyatsu.ru
Russian Federation, Kirov

A. Y. Stroeva

Vyatka State University

Email: usr20264@vyatsu.ru
Russian Federation, Kirov

B. A. Ananchenko

Vyatka State University

Email: usr20264@vyatsu.ru
Russian Federation, Kirov

V. A. Ichetovkina

Vyatka State University

Email: usr20264@vyatsu.ru
Russian Federation, Kirov

A. V. Kuzmin

Vyatka State University

Email: a.v.kuzmin@yandex.ru
Russian Federation, Kirov

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Supplementary files

Supplementary Files
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2. Fig. 1. Effect of calcination temperature on the phase formation of La0.9Sr0.1Mn0.8Sc0.2O3 – δ.

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3. Fig. 2. Dependence of the density of La0.9Sr0.1Sc1 – xMnxO3 – δ (x = 0.02–0.20) ceramics sintered at 1550 °C on the temperature of preliminary variation annealing.

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4. Fig. 3. Dependence of the density of the resulting La0.9Sr0.1Sc1 – xMnxO3 – δ ceramics on the dopant concentration at sintering temperatures of 1450, 1550 and 1650 oC. The inset shows microphotographs of broken ceramic samples La0.9Sr0.1Sc0.95Mn0.05O3 – δ and La0.9Sr0.1Sc0.8Mn0.2O3 – δ, sintered at a temperature of 1550 oC.

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5. Fig. 4. Microphotographs of the resulting La0.9Sr0.1Sc0.95Mn0.05O3 – δ powder after the combustion stage (a), after grinding (b).

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6. Fig. 5. Microphotographs of broken ceramics La0.9Sr0.1Sc0.95Mn0.05O3 – δ (a) and La0.9Sr0.1Sc0.6Mn0.4O3 – δ (b).

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7. Fig. 6. X-ray diffraction patterns of La0.9Sr0.1Sc1– xMnxO3 – δ.

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8. Fig. 7. Concentration dependence of the unit cell volume La0.9Sr0.1Sc1– xMnxO3 – δ; unit cell volume obtained by the Rietveld method (square icons); volume of a pseudocubic cell with Mn3+ (solid line); volume of a pseudocubic cell with Mn4+ (dashed line).

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9. Fig. 8. Temperature dependences of La0.9Sr0.1Sc1– xMnxO3 – δ samples in an atmosphere of dried air pH2O ≤ 0.1 kPa (a) and in an atmosphere of humidified air pH2O = 2.8 kPa (b).

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10. Fig. 9. Concentration dependence of the conductivity of La0.9Sr0.1Sc1 – xMnxO3 – δ samples at a temperature of 800 °C in an atmosphere of dried air (pH2O ≤ 0.1 kPa) and in an atmosphere of humidified air (pH2O = 2.8 kPa).

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