Effects of Ag-Doping on Thermoelectric Properties of Ca(2−x)AgxSi Alloys
| Autor: | Yuezhen Jiang, Xingkai Duan, Dengliang Yi, Jing Kuang, Konggang Hu |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics Doping Analytical chemistry 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics Hot pressing 01 natural sciences Electronic Optical and Magnetic Materials Degenerate semiconductor Thermal conductivity Electrical resistivity and conductivity Seebeck coefficient 0103 physical sciences Thermoelectric effect Materials Chemistry Electrical and Electronic Engineering 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of Electronic Materials. 46:2986-2989 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-016-5088-y |
| Popis: | Ca(2−x)AgxSi (0 ≤ x ≤ 0.1) with 47.5% excess of Ca alloys were fabricated by melting in a tantalum tube and hot pressing technique. Phase structures of the samples were studied by means of x-ray diffraction. The electrical conductivity and Seebeck coefficient of Ca(2−x)AgxSi alloys were studied in the temperature range of 300–873 K. The electrical conductivity of the Ag-doped samples increases within the whole test temperature range. All samples show p-type semiconductor behavior. The electrical conductivity decreases with increasing temperature from 300 K to 873 K, which is typically observed for a degenerate semiconductor. Compared with the undoped samples, Ag-doping (x = 0.04–0.1) results in decreases of Seebeck coefficient, especially Ca(2−x)AgxSi with x = 0.1. The thermal conductivity of the doped samples gradually increases with increasing the Ag-doping content. The Ca(2−x)AgxSi with x = 0.02 sample exhibits the lowest thermal conductivity within the whole test temperature range. The ZT values of Ca(2−x)AgxSi with x = 0.02 sample have an enhancement in the temperature range of 300–873 K by contrast with those of the Ca2Si sample. The maximum ZT value is 0.16 at 837 k, which is observed for the Ca(2−x)AgxSi with x = 0.04 sample. |
| Databáze: | OpenAIRE |
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