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Chemical alloying method for fabrication of nano-structured Bi-Te alloys

A novel chemical alloying method has been developed for the fabrication of nanocrystalline Bi-Te alloys. The method consists of a combination of solution chemical method and thermal processing under controlled heating conditions. The components have been co-precipitated from a solution and the precursor consists of a solid solution of the different intermediate compounds, and exhibits high reactivity.

Calcination and hydrogen reduction of the precursor at moderate temperature, 350degrees Celsius, for 2 hrs resulted in the alloying of these elements to obtain the pure phase of the thermoelectric material. The method developed in this work is simpler than conventional melt processing and produced a 95-98% yield in laboratory-scale.

High concentration of grain boundaries provided by nanostructuring is expected to lower the thermal conductivity of the material and further increase the thermoelectric performance.

More information on the NANOTHERMEL project can be found at:

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Royal Institute of Technology
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