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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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Published in: | Journal of solid state chemistry 2021-09, Vol.301, Article 122324 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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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. |
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ISSN: | 0022-4596 1095-726X |
DOI: | 10.1016/j.jssc.2021.122324 |