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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Applied Chemistry Springer Journals

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

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Publisher
Springer Journals
Copyright
Copyright © 2015 by Pleiades Publishing, Ltd.
Subject
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
ISSN
1070-4272
eISSN
1608-3296
D.O.I.
10.1134/S1070427215080030
Publisher site
See Article on Publisher Site

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.

Journal

Russian Journal of Applied ChemistrySpringer Journals

Published: Nov 21, 2015

References

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