In the case of metal, especially Platinum, it shows a plus Seebeck coefficient at a low temperature. I cannot understand why the sign of the Seebeck coefficient change at the low temperature from minus to plus. Could anyone tell me the reason for this phenomenon?
(Is this related to the phonon drag?)
Thank you!
Dear Hong Seokkyoon :
I found this paper where they show a graph where they include the Seebeck Coefficient of Platinum vs. Temperature. And indeed, as you said, as T increases, the S got from the positives to the negatives. Maybe this article can help you to find the possible reasons.
Regards !
Dear H. Seokkyoon :
I'm curious, did you find the answer to your problem sir ?
Did the paper was useful ? I looked at it and it seemed pretty old. Did the graph in the paper are similar as yours ?
Regards !
Dear Hong,
the Seebeck coefficient consists of 2 contributions. The first part, generally known, is the thermodiffusion part and the second the phonon drag. I attache our paper concerning this (see formulae 9 and detailed explanations).
With Regard
R. Mitdank
- Badges
- Science topic