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Electro-migration of Zinc during current-assisted pressure sintering of β-Zn4Sb3 – effect of process parameters and its influence on the thermoelectric properties

  • T. Dasgupta (a1), C. Stiewe (a1), L. Boettcher (a1), H. Yin (a2), B.B. Iversen (a2) and E. Mueller (a1)...

Abstract

Compaction of β-Zn4Sb3 was carried out by current-assisted short term sintering under pressure (STS) using different material and process parameters. Surface Seebeck mapping (PSM) of the compacted specimens (along the uniaxial pressing direction) shows a wide gradation ranging from ∼40–180 μV/K due to electro-migration of Zinc along the current direction. The wide distribution of S corresponds to a mixture of Zn-Sb phases [1] which arise depending on the extent of Zinc migration during the STS process. Variation in the material and process parameters (average particle size, heating rate, compaction time/temperature) results in different spatial distribution of S. Measurements of electrical (σ), thermal (κ) conductivities and Seebeck (S) coefficients between room temperature and 523 K were carried out on two specimens having different average S values and distributions as observed by the PSM. The results indicate an increase in the lattice thermal conductivity (κL) and subsequent lower ZT in the specimens compared to the reported values for β-Zn4Sb3.

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References

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1. Dasgupta, T., Stiewe, C., Boettcher, L., Hassdorf, R., Yin, H., Iversen, B. and Mueller, E., Journal of Materials Research-Focus Issue on Thermoelectrics (2011), article in press.
2. Caillat, T., Fleurial, J.P., and Borshchevsky, A., Journal of Physics and Chemistry of Solids, 58(7), 1119 (1997).
3. Pedersen, B.L. and Iversen, B.B., Applied Physics Letters, 92, 161907 (2008).
4. Stiewe, C., Dasgupta, T., Boettcher, L., Pedersen, B., Mueller, E., Iversen, B.B., Journal of Electronic Materials, 39(9), 1975 (2009).
5. Iversen, B.B., Journal of Materials Chemistry, 20, 10778 (2010).
6. Toberer, E.S., Raewel, P., Gariel, S., Tafto, J. and Snyder, G.J., Journal of Materials Chemistry, 20, 9877 (2010).
7. Ziolkowski, P., Karpinski, G., Platzek, D., Stiewe, C and Mueller, E., 25th Int. Conf. Thermoelectrics, p. 684 (2006).

Keywords

Electro-migration of Zinc during current-assisted pressure sintering of β-Zn4Sb3 – effect of process parameters and its influence on the thermoelectric properties

  • T. Dasgupta (a1), C. Stiewe (a1), L. Boettcher (a1), H. Yin (a2), B.B. Iversen (a2) and E. Mueller (a1)...

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