Abstract
Materials based on layered calcium (Ca3Co4O9 + δ) and calcium-bismuth (Bi2Ca2Co1.7O y ) cobaltites were derived based on a technique of solid-phase reactions. Their thermal expansion, electrical conductivity, and thermoelectric power were found. It was demonstrated that these materials are p-type semiconductors with a coefficient of linear thermal expansion (11.4–12.8) × 10–6 K–1. It was found that the phase separation of the material leads to a reduction in the electrical conductivity and an increase in the Seebeck coefficient and power factor, which reaches its maximum value (0.24 mW m–1 K–2 at T = 1100 K) for materials containing approximately equal amounts of phases Ca2.7Bi0.3Co4O9+δ and Bi2Ca2Co1.7O y . Ffunctional characteristics of the thermoelectric material are evidence of its promising use in high temperature thermoelectric generators.
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Original Russian Text © I.V. Matsukevich, A.I. Klyndyuk, E.A. Tugova, M.V. Tomkovich, N.S. Krasutskaya, V.V. Gusarov, 2015, published in Zhurnal Prikladnoi Khimii, 2015, Vol. 88, No. 8, pp. 1117-1123.
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Matsukevich, I.V., Klyndyuk, A.I., Tugova, E.A. et al. Synthesis and properties of materials based on layered calcium and bismuth cobaltites. Russ J Appl Chem 88, 1241–1247 (2015). https://doi.org/10.1134/S1070427215080030
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DOI: https://doi.org/10.1134/S1070427215080030