Thermoelectric properties of p-Bi2 − x Sb x Te3 solid solutions under pressure
| Autor: | Grigoriy V. Vorontsov, Sergey V. Ovsyannikov, Vsevolod V. Shchennikov, L. N. Luk’yanova, Yu. A. Grigor’eva, V. A. Kutasov |
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| Rok vydání: | 2012 |
| Předmět: |
Electron mobility
Materials science Condensed matter physics chemistry.chemical_element Condensed Matter Physics Electronic Optical and Magnetic Materials Bismuth chemistry.chemical_compound Effective mass (solid-state physics) chemistry Seebeck coefficient Thermoelectric effect Density of states Bismuth telluride Solid solution |
| Zdroj: | Physics of the Solid State. 54:261-266 |
| ISSN: | 1090-6460 1063-7834 |
| Popis: | This paper reports on a study of the Seebeck coefficient and power factor κ of p-Bi2 − xSbxTe3 solid solutions with different contents of antimony atoms in the bismuth sublattice for x = 0, 1.4, 1.5, and 1.6 under variation of pressure of up to 15 GPa. The magnitude of κ has been found to grow nonmonotonically within the pressure region of 2–4 GPa. The effective mass of the density of states m/m0 and the mobility μ0 have been calculated with due account of degeneracy within the parabolic model of the energy spectrum assuming isotropic charge carrier scattering. It has been shown that application of pressure brings about a decrease of the effective mass m/m0 and an increase of carrier mobility. The power factor κ of the p-Bi0.6Sb1.4Te3 composition exhibits at the pressure P ≈ 4 GPa the largest increase of the power factor κ as a result of a weak decrease of the effective mass m/m0 and an increase of carrier mobility as compared to the other solid solution compositions. The specific feature of the variation of the power factor κ with a change of the pressure in bismuth telluride near P ≈ 3 GPa, which is accompanied by formation of a knee in the m/m0 vs. P dependence, can be assigned to an electronic topological transition. |
| Databáze: | OpenAIRE |
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