About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XII
|
Presentation Title |
Thermoelectric Properties of Layered AMX Compounds with Tunable Vacancy Concentrations and Interlayer Bonding |
Author(s) |
Alexandra Zevalkink |
On-Site Speaker (Planned) |
Alexandra Zevalkink |
Abstract Scope |
Ternary AMX Zintls with honeycomb-like MX layers have been recently gaining interest as promising thermoelectric materials. The first part of this talk will explore the impact of vacancies on the thermoelectric properties of the EuCuSb-EuZn0.5Sb solid solution. We find that vacancies in the planar MX honeycomb lattice cause a decrease in sound velocity and a sharp increase in point defect scattering. These effects combine to yield an 80 % decrease in lattice thermal conductivity and increase in zT to 0.8. The second half of this talk is an investigation of the CaAgSb-CaAgBi solid solution, which exhibits a structural transition from the orthorhombic structure to the hexagonal structure. Here, the stiffness of the samples decrease with increasing Bi‐content, followed by a surprising stiffening corresponding to the 3D to 2D structural transformation. This material system also exhibits an extremely low Lorenz number, although the origin of this behavior is not yet understood. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, Electronic Materials, Phase Transformations |