The electrical properties of codoping LaInO3 perovskite

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This paper is devoted to the study of LaInO3 based co-doped materials. Solid solutions in which lanthanum is substituted for strontium have sufficiently high conductivity values, but a low level of oxygen deficiency is realized. Mg2+ and Ca2+ ions were chosen as co-dopants for the B sublattice. Both series of the investigated La0.9Sr0.1In1-xCaxO2.95–0.5x and La0.9Sr0.1In1-yMgyO2.95-0.5y solid solutions crystallize in orthorhombic symmetry with sp. gr. Pnma. The ionic conductivity in a dry atmosphere is determined by the oxygen ions transport. Oxygen-ion transfer in solid solutions is ~30–40% at high temperatures (T > 700°C) and increases to >80% as the temperature decreases to 400–300°C. The substitution Ca2+ with In3+ increases the electrical conductivity of the oxygen ions; the highest values are achieved for the compositions La0.9Sr0.1In0.95Ca0.05O2.925 and La0.9Sr0.1In0.9Ca0.1O2.9. The introduction of Mg2+ co-dopant at the In3+ positions leads to a decrease in ionic conductivity compared to La0.9Sr0.1InO2.95. The effects of changing oxygen mobility with changing geometric factors (cell volume, critical radius) are discussed.

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Sobre autores

K. Belova

Institute of High Temperature Electrochemistry, UB RAS; Ural Federal University named after the first President of Russia, B. N. Yeltsin

Email: OAV-hn@yandex.ru
Rússia, Yekaterinburg, 620002; Yekaterinburg, 620002

А. Egorova

Institute of High Temperature Electrochemistry, UB RAS; Ural Federal University named after the first President of Russia, B. N. Yeltsin

Autor responsável pela correspondência
Email: OAV-hn@yandex.ru
Rússia, Yekaterinburg, 620002; Yekaterinburg, 620002

S. Pachina

Ural Federal University named after the first President of Russia, B. N. Yeltsin

Email: OAV-hn@yandex.ru
Rússia, Yekaterinburg, 620002

N. Tarasova

Institute of High Temperature Electrochemistry, UB RAS; Ural Federal University named after the first President of Russia, B. N. Yeltsin

Email: OAV-hn@yandex.ru
Rússia, Yekaterinburg, 620002; Yekaterinburg, 620002

I. Animitsa

Institute of High Temperature Electrochemistry, UB RAS; Ural Federal University named after the first President of Russia, B. N. Yeltsin

Email: OAV-hn@yandex.ru
Rússia, Yekaterinburg, 620002; Yekaterinburg, 620002

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2. Fig. 1. X-ray diffraction pattern of the La0.9Sr0.1In0.9Ca0.1O2.9 sample, refined by the Le Bail method, and the change in cell volume depending on the dopant content (inset).

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3. Fig. 2. Impedance hodographs for the La0.9Sr0.1InO2.95 solid solution at different temperatures and the equivalent circuit used for processing.

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4. Fig. 3. Temperature dependences of the total electrical conductivity for (a) La0.9Sr0.1In1–yMgyO2.95–0.5y and (b) La0.9Sr0.1In1–xCaxO2.95–0.5 solid solutions.

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5. Fig. 4. Dependence of the total electrical conductivity of the La0.9Sr0.1In0.95Mg0.05O2.925 sample on the partial pressure of oxygen at different temperatures (a) and the temperature dependences of the total (1), oxygen-ion (2) and hole (3) conductivity for La0. 9Sr0.1In0.95Mg0.05O2.925 (pO2 = 0.21 atm) (b).

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6. Fig. 5. Temperature dependences of ionic transport numbers for La0.9Sr0.1In1–yMgyO2.95–0.5y (a) and (b) La0.9Sr0.1In1–xCaxO2.95–0.5x solid solutions.

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7. Fig. 6. Temperature dependences of oxygen-ion electrical conductivity for solid solutions La0.9Sr0.1In1–yMgyO2.95–0.5y (a) and La0.9Sr0.1In1–xCaxO2.95–0.5x (b).

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8. Fig. 7. Concentration dependences of total (a) and oxygen-ion (b) conductivity and their activation energies at a temperature of 700°C for La0.9Sr0.1In1–yMgyO2.95–0.5y solid solutions.

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9. Fig. 8. Concentration dependences of total (a) and oxygen-ionic (b) conductivity and their activation energies at a temperature of 700°C for La0.9Sr0.1In1–xCaxO2.95–0.5x solid solutions.

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10. Fig. 9. Concentration dependences of oxygen mobility and ionic transport numbers for La0.9Sr0.1In1–yMgyO2.95–0.5y (a) and La0.9Sr0.1In1–xCaxO2.95–0.5x (b) solid solutions at a temperature of 700°C.

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11. Fig. 10. Change in the critical radius depending on the dopant content.

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