Synthesis and properties of Na x CoO2 (x = 0.55, 0.89) oxide thermoelectrics
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- 作者：N. S. Krasutskaya ; A. I. Klyndyuk ; L. E. Evseeva ; S. A. Tanaeva
- 关键词：oxide thermoelectrics ; sodium cobaltite ; power factor ; thermoelectric figure of merit
- 刊名：Inorganic Materials
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：52
- 期：4
- 页码：393-399
- 全文大小：1,029 KB
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A. I. Klyndyuk (1)
L. E. Evseeva (2)
S. A. Tanaeva (2)
1. Belarussian State Technological University, str. Sverdlova 13a, Minsk, 220050, Belarus
2. A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, str. Brovki 15, Minsk, 220072, Belarus - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Inorganic Chemistry
Industrial Chemistry and Chemical Engineering
Materials Science
Russian Library of Science - 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
- ISSN：1608-3172
文摘
Na x CoO2 (x = 0.55, 0.89) sodium cobaltites have been prepared by solid-state reactions; their structural parameters have been determined; their microstructure has been studied; and their thermal (thermal expansion, thermal diffusivity, and thermal conductivity), electrical (electrical conductivity and thermoelectric power), and functional (power factor, thermoelectric figure of merit, and self-compatibility factor) properties have been investigated in air at temperatures from 300 to 1100 K. The results demonstrate that, with increasing sodium content, the electrical conductivity and thermoelectric power of the materials increase and their thermal conductivity decreases. As a result, the power factor and thermoelectric figure of merit of the Na0.89CoO2 ceramic at a temperature of 1100 K reach 0.829 mW/(m K2) and 1.57, respectively. The electron and phonon (lattice) contributions to the thermal conductivity of the ceramics have been separately assessed, and their linear thermal expansion coefficients have been evaluated.