Structure and Thermoelectric Properties of β-FeSi2 Doped with Cobalt
F. Yu. SolomkinIoffe Physicotechnical Institute, Russian Academy of Sciences, 194021, St. Peterburg, RussiaН. В. ШаренковаIoffe Physicotechnical Institute, Russian Academy of Sciences, 194021, St. Peterburg, RussiaГ. Н. ИсаченкоIoffe Physicotechnical Institute, Russian Academy of Sciences, 194021, St. Peterburg, RussiaA. Yu. SamuninIoffe Physicotechnical Institute, Russian Academy of Sciences, 194021, St. Peterburg, RussiaA. A. ShabаldinIoffe Physicotechnical Institute, Russian Academy of Sciences, 194021, St. Peterburg, RussiaI. A. KulikIoffe Physicotechnical Institute, Russian Academy of Sciences, 194021, St. Peterburg, RussiaN. A. ArcharovaShubnikov Institute of Crystallography, Kurchatov Complex of Crystallography and Photonics, National Research Center “Kurchatov Institute”, 119333, Moscow, RussiaМ. S. LukasovShubnikov Institute of Crystallography, Kurchatov Complex of Crystallography and Photonics, National Research Center “Kurchatov Institute”, 119333, Moscow, Russia
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The possibility of replacing iron with cobalt in iron disilicide is studied. It has been shown that, in a wide range of compositions, an attempt to replace iron with cobalt leads to the formation of cobalt silicides. Using the composition Fe0.98Co0.015Si2 as an example, it is shown that during the directional crystallization and subsequent annealing of samples, a regular microstructure is formed. Anisotropy of thermoelectric properties is observed along and across the crystallization axis of the sample. In the region of low cobalt concentrations, upon transition to pure β-FeSi2, the sign and magnitude of thermopower change sharply.
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