Reactive sintering process and thermoelectric properties of boron rich boron carbides |
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Affiliation: | 1. Institute of Physics of the Academy of Sciences of the Czech Republic, v.v.i., Na Slovance 2, 18221 Prague, Czech Republic;2. Institute of Photonics and Electronics of the Academy of Sciences of the Czech Republic, v.v.i., Chaberská 57, 18251 Prague, Czech Republic;3. Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic, v.v.i., Heyrovského nám. 2, 16206 Prague, Czech Republic;4. Czech Technical University, Faculty of Biomedical Engineering, Sitna 3105, 27201 Kladno, Czech Republic;5. Institute of Information Theory and Automation of the Academy of Sciences of the Czech Republic, v.v.i., Pod Vodárenskou věží 4, 18208 Prague, Czech Republic |
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Abstract: | Dense boron rich boron carbides were reactive sintered by hot pressing at 2050 °C using elementary boroncarbon compositions with carbon contents of 9.1, 11.1, 13.3 and 18.8 at.%. The following material characteristics are presented: relative density, SEM images, EDX, X-ray diffraction and corresponding lattice parameters, Seebeck coefficient, electrical conductivity and thermoelectric power factor. Significant grain growth has been obtained with increasing boron content. A deeper understanding of the boron and carbon reaction and the overall sintering process is gained by thermal and chemical analysis in combination with X-ray diffraction. Additionally a thermal experiment with boron and carbon layers illustrates the solid state diffusion behaviour. The found results of boron carbide properties of this paper correspond with results by other authors. The aim is to correlate technological aspects of sintering procedure with material properties. This should help to improve the thermoelectric efficiency of boron carbide based materials. |
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Keywords: | Reactive sintering Boron carbide Lattice parameters Solid state diffusion Thermoelectrics |
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