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

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1. Title Title of document Synthesis and physico-chemical properties La0.9Sr0.1Sc1 – xMnxO3 – δ ceramic materials with mixed electron and ion conductivity
2. Creator Author's name, affiliation, country O. S. Bervitskaya; Vyatka State University; Russian Federation
2. Creator Author's name, affiliation, country A. Y. Stroeva; Vyatka State University; Russian Federation
2. Creator Author's name, affiliation, country B. A. Ananchenko; Vyatka State University; Russian Federation
2. Creator Author's name, affiliation, country V. A. Ichetovkina; Vyatka State University; Russian Federation
2. Creator Author's name, affiliation, country A. V. Kuzmin; Vyatka State University; Russian Federation
3. Subject Discipline(s)
3. Subject Keyword(s) perovskites; lanthanum scandate; doping; proton conductivity
4. Description 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.
5. Publisher Organizing agency, location The Russian Academy of Sciences
6. Contributor Sponsor(s)
7. Date (DD-MM-YYYY) 12.07.2024
8. Type Status & genre Peer-reviewed Article
8. Type Type Research Article
9. Format File format
10. Identifier Uniform Resource Identifier https://ruspoj.com/0424-8570/article/view/671653
10. Identifier Digital Object Identifier (DOI) 10.31857/S0424857024010019
10. Identifier eLIBRARY Document Number (EDN) GPWUPN
11. Source Title; vol., no. (year) Èlektrohimiâ; Vol 60, No 1 (2024)
12. Language English=en ru
13. Relation Supp. Files Fig. 1. Effect of calcination temperature on the phase formation of La0.9Sr0.1Mn0.8Sc0.2O3 – δ. (82KB)
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. (84KB)
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. (218KB)
Fig. 4. Microphotographs of the resulting La0.9Sr0.1Sc0.95Mn0.05O3 – δ powder after the combustion stage (a), after grinding (b). (274KB)
Fig. 5. Microphotographs of broken ceramics La0.9Sr0.1Sc0.95Mn0.05O3 – δ (a) and La0.9Sr0.1Sc0.6Mn0.4O3 – δ (b). (177KB)
Fig. 6. X-ray diffraction patterns of La0.9Sr0.1Sc1– xMnxO3 – δ. (115KB)
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). (69KB)
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). (141KB)
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). (60KB)
14. Coverage Geo-spatial location, chronological period, research sample (gender, age, etc.)
15. Rights Copyright and permissions Copyright (c) 2024 Russian Academy of Sciences