About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XIV
|
| Presentation Title |
Phonon Engineering and Thermoelectric Properties in Nowotny Chimney-Ladder Compounds |
| Author(s) |
Xi Chen |
| On-Site Speaker (Planned) |
Xi Chen |
| Abstract Scope |
Nowotny chimney-ladder (NCL) phases are a class of intermetallic binary compounds that have garnered increasing attention for their promising thermoelectric performance. In this talk, I will first present our work on the crystal growth and thermoelectric properties of Fe2Ge3, an NCL compound. Millimeter-sized single crystals grown via chemical vapor transport enable the investigation of intrinsic transport behavior. These crystals exhibit a low thermal conductivity of 1.9 W/m·K at 300 K and nearly temperature-independent thermal transport, likely due to strong scattering between acoustic and low-energy optical phonons. Next, I will discuss nanopore engineering in higher manganese silicides, another NCL compound. A melt-quenching followed by annealing process introduces pores ranging from tens of nanometers to several micrometers, leading to glass-like thermal conductivity. A two-channel model, incorporating both propagons and diffusons, was employed to analyze the phonon transport behavior. These findings demonstrate effective phonon engineering strategies for advancing the thermoelectric performance of NCL-based materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Energy Conversion and Storage, Electronic Materials, Characterization |