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Researchers have developed a new low-cost electrical contact material for thermoelectric devices that is stable at high temperatures and gives more than 10 percent conversion efficiency.

Researchers from the International Advanced Research Centre for Powder Metallurgy & New Materials (ARCI), an autonomous institute of the Department of Science & Technology, have designed and developed thermoelectric modules using lead telluride (PbTe) and magnesium stannite silicide (Mg2Si1-xSnx) compounds, a release from the Union Science and Technology Ministry said on Tuesday.

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This work has been published in the journal ‘Materials Research Bulletin recently.

A thermoelectric material can generate electricity by using a temperature difference between its two sides. A thermoelectric device can also function as a small heat pump, moving heat from one side of the device to the other.

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Thermoelectric materials convert thermal energy directly into electricity through a process that involves a solid-state electron and photon diffusion process. Though the principle is known for two centuries, it had limited utility as most known thermoelectric materials’ energy conversion efficiency is very low. Nanotechnology brought innovations to improve the efficiency of materials, but the mass-market application of such innovations has remained restricted due to the low device conversion efficiency of 6-10 percent. This makes the electricity produced costlier than other technologies.

The current study synthesized the bismuth-doped magnesium silicide stannide powder by induction melting of constituent elements and ball milling of the solidified ingots was hot-pressed with SS304 and copper (Cu) powders. The joint’s specific contact resistance is around 4.4 uU.cm2, which is the lowest value reported so far in this material, the release said, adding, “The joint showed excellent thermal stability up to 450 degrees Celsius temperature when tested for 15 days, with insignificant change in the reaction layers’ thickness at the interface. By using these joints, a thermoelectric device has been developed successfully and tested for its performance.”

The study can be accessed here: https://doi.org/10.1016/j.materresbull.2020.111147

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