The effect of nano-twins on the thermoelectric properties of Ga2O3(ZnO)m (m = 9, 11, 13 and 15) homologous compounds
| Autor: | Thomas Slater, Sarah J. Day, Diana T. Alvarez-Ruiz, Feridoon Azough, Robert Freer |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Nanostructure Materials science Thermoelectric Analytical chemistry Homologous compounds 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ion Thermal conductivity Atomic resolution visual_art 0103 physical sciences Nano Thermal Thermoelectric effect Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic 0210 nano-technology |
| Zdroj: | Alvarez-Ruiz, D T, Azough, F, Slater, T, Day, S J & Freer, R 2020, ' The effect of nano-twins on the thermoelectric properties of Ga2O3(ZnO)(m) (m=9, 11, 13 and 15) homologous compounds ', Journal of the European Ceramic Society, vol. 40, no. 15, pp. 5549-5558 . https://doi.org/10.1016/j.jeurceramsoc.2020.07.021, https://doi.org/10.1016/j.jeurceramsoc.2020.07.021 |
| ISSN: | 0955-2219 |
| Popis: | Ga 2O 3(ZnO) m (m = integer) homologous compounds are naturally occurring nanostructured materials. Their intrinsically low thermal conductivity makes them attractive for thermoelectric applications. High density Ga 2O 3(ZnO) m (m = 9, 11, 13, and 15) single phase ceramics were prepared by solid-state reaction. Nano-sized, twin-like V-shaped boundaries parallel to b-axis (apex angle ∼ 60°) were observed for all compositions. Atomic resolution Z-contrast imaging and EDS analysis for m = 15 showed segregation of Ga ions at the interface of V-shaped twin boundaries. Thermal and charge transport properties depend on the value of m. Compositions with m = 9 exhibited very low lattice thermal conductivity of 2 to 1.5 W/m.K at 300 K–900 K; compositions with m=15 showed improved power factor of 140 μW/m. K 2 at 900 K leading to a thermoelectric figure of merit (ZT value) of 0.055. This study explores the structural variants and routes to improve the thermoelectric properties of these materials |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect