Synthesis and properties of materials based on layered calcium and bismuth cobaltites

Synthesis and properties of materials based on layered calcium and bismuth cobaltites 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. Russian Journal of Applied Chemistry Springer Journals

Synthesis and properties of materials based on layered calcium and bismuth cobaltites

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Pleiades Publishing
Copyright © 2015 by Pleiades Publishing, Ltd.
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
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