The synthesis and thermoelectric properties of the Gadolinium-doped GexPb1-xTe material

Cui, Yuqin (2018) The synthesis and thermoelectric properties of the Gadolinium-doped GexPb1-xTe material. Bachelor's Thesis, Chemistry.

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Abstract

TE materials attracted a lot of attention during the last three decades due to their abilities to convert heat directly to electricity. There are several popular TE materials reported these years, including PbTe, GeTe, LAST and TAGS. Among these, the PbTe-GeTe alloy with different ratios was developed these years. However, with relatively high Seebeck coefficient and electrical conductivity, the thermal conductivities of PbTe-GeTe alloy are also pretty high (around 2.5 Wm-1K-1). Thus, an extra element was doped in the binary system. In this bachelor thesis, the GexPb1-xTe based materials doped by 2% gadolinium with two different sites (cation and anion) and different synthesis methods were investigated to improve the thermoelectric properties by reducing thermal conductivity while maintaining the other factor. The result showed that the thermal conductivity of all samples reduced at least 2 times compared to the reference one. The optimized and stable sample was Gd-doped in anion site with excess Ge and via air-cooling method, showing the lowest thermal conductivity around 0.4 Wm-1K-1 in third cycle measurement.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Blake, G.R.
Degree programme:	Chemistry
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	11 Jul 2018
Last Modified:	13 Jul 2018 08:48
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/17779

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