Synthesis and properties of Na x CoO2 (x = 0.55, 0.89) oxide thermoelectrics
| Autor: | N. S. Krasutskaya, L. E. Evseeva, S. A. Tanaeva, Andrei Klyndyuk |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science General Chemical Engineering Metals and Alloys Mineralogy 02 engineering and technology 021001 nanoscience & nanotechnology Thermal diffusivity Thermoelectric materials 01 natural sciences Thermal expansion Inorganic Chemistry Thermal conductivity Thermoelectric generator Electrical resistivity and conductivity visual_art Seebeck coefficient 0103 physical sciences Materials Chemistry visual_art.visual_art_medium Ceramic Composite material 0210 nano-technology |
| Zdroj: | Inorganic Materials. 52:393-399 |
| ISSN: | 1608-3172 0020-1685 |
| Popis: | NaxCoO2 (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. |
| Databáze: | OpenAIRE |
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