About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
Investigation of Thermoelectric Performance of n-type Mg<sub>3</sub>Sb<sub>2</sub> at High Temperatures With Mg Excess Compositions |
| Author(s) |
Harish Subramania Iyer, Raju Chetty, Jayachandran Babu, Takao Mori |
| On-Site Speaker (Planned) |
Harish Subramania Iyer |
| Abstract Scope |
The n-type Mg<sub>3</sub>Sb<sub>2</sub> thermoelectric (TE) material has advantages like low density, absence of toxic elements and low device fabrication cost. To accelerate the commercialization of this material, Mg evaporation/migration at high temperatures (~700<sup>o</sup>C), which the material may be subjected to during module fabrication stages (joining steps), has to be addressed. In the present study, a simple, cost-effective method of increasing Mg content in initial stoichiometry, is followed. The synthesized compositions are subjected to high temperature conditions under different atmospheric conditions and their TE performance are evaluated. It is observed that heating in partial pressure conditions under high vacuum maintains TE properties better after heating compared to heating the samples in static low vacuum conditions. Also, the power factor and thermal conductivity showed minimal variations for various excess Mg compositions after heating. The influence of excess Mg in minimizing the Mg evaporation/migration and maintaining the TE properties will be discussed. |