| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XIII
|
| Presentation Title |
Exploring the Pseudo-Hollandite Family of Compounds for High Temperature Thermoelectric Applications |
| Author(s) |
Hugo Bouteiller, Bruno Fontaine, Yoshitaka Matsushita, Sylvie Hébert, Takao Mori, Franck Gascoin, Jean-François Halet, David Berthebaud |
| On-Site Speaker (Planned) |
Hugo Bouteiller |
| Abstract Scope |
Among the transition metal chalcogenides, the pseudo-hollandite family of compounds of typical formulae AxM5X8 (A = Rb, Ba, Tl, K, Sr, In, Cs; M = Ti, V, Cr; X = S, Se, Te) have recently attracted substantial interest for thermoelectric applications. These compounds feature an anionic framework of M-centered MSe6 octahedra forming infinite channels along the b-axis, which can be filled with mono- and/or dicationic elements to balance the charge and stabilize the structure. Their structural complexity and chemical flexibility make them promising thermoelectric materials due to i) low lattice thermal conductivity, ii) semiconducting behavior, and iii) flexible charge carrier concentration optimization. This work presents several pseudo-hollandites, detailing their synthesis and the relationship between their structure and transport properties. Special focus is on the new quaternary chromium selenide Rb0.2Ba0.4Cr5Se8, which shows an intriguing decoupling of its Seebeck coefficient and resistivity, significantly enhancing its thermoelectric properties compared to related materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Energy Conversion and Storage, Electronic Materials, High-Temperature Materials |