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Effect of cobalt content on the properties of quintuple perovskites Sm2Ba3Fe5-xCoxO15-δ

Quintuple perovskites Sm2Ba3Fe5-xCoxO15-δ (x ​= ​0.5, 1.0 and 1.5) have been prepared by glycerin-nitrate technique in air. The phase purity was confirmed by XRD. Partial substitution of Co for Fe decreases the oxygen content and thus the mean oxidation state of 3d-metals. It also slightly decreases...

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Bibliographic Details
Published in:Journal of solid state chemistry 2021-09, Vol.301, Article 122324
Main Authors: Golovachev, I.B., Mychinko, M. Yu, Volkova, N.E., Gavrilova, L. Ya, Raveau, B., Maignan, A., Cherepanov, V.A.
Format: Article
Language:English
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Summary:Quintuple perovskites Sm2Ba3Fe5-xCoxO15-δ (x ​= ​0.5, 1.0 and 1.5) have been prepared by glycerin-nitrate technique in air. The phase purity was confirmed by XRD. Partial substitution of Co for Fe decreases the oxygen content and thus the mean oxidation state of 3d-metals. It also slightly decreases the thermal expansion coefficient of oxides. Positive value of the Seebeck coefficient confirmed p-type conductivity, though the thermopower decreases as the Co content increases. The temperature dependence of electrical conductivity reveals a maximum at 550–750°С. Temperature dependencies of total conductivity for Sm2-ϵBa3+ϵFe5-xCoxO15-δ in air. [Display omitted] •The Sm2Ba3Fe5-xCoxO15-δ oxides have been synthesized by the glycerin nitrate technique in air.•The temperature dependencies of oxygen content in Sm2Ba3Fe5-xCoxO15-δ were determined.•Temperature dependencies of conductivity and Seebeck coefficient were measured.•Thermal expansion coefficient has been determined.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2021.122324