| Autor: |
Ivanov, A. A., Bogomolov, D. I., Bublik, V. T., Voronov, M. V., Lavrentev, M. G., Panchenko, V. P., Parkhomenko, Yu. N., Tabachkova, N. Yu. |
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| Zdroj: |
Journal of Electronic Materials; May2020, Vol. 49 Issue 5, p2704-2709, 6p |
| Abstrakt: |
In this work we explored the possibility of obtaining single-phase β-Zn4Sb3 material by direct melting and spark plasma sintering (SPS). The effect of the SPS conditions and synthesized material composition on the structure and thermoelectric properties of the material was studied. X-ray diffraction was used for phase analysis, and scanning electron microscopy was used for characterizing the morphology of the bulk samples. We found electro-migration of Zn due to the exposure to DC pulses during SPS at 40 MPa. Zinc electro-migration produced a zinc-excess layer on the sample surface on the cathode side and a zinc-depleted layer, i.e., ZnSb, on the anode side of the sample. We show that an increase in the sintering pressure, and hence a decrease in the electric current passing through the material, produces single-phase β-Zn4Sb3 material in the entire sample bulk, provided the synthesized material contains excess zinc. The highest ZT of ∼ 1.28 at 673 K was obtained for the material synthesized with Zn excess and sintered by SPS at a pressure of 100 MPa. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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