Journalartikel

Jahr der Veröffentlichung: 2016

Zeitschrift: Journal of Applied Physics

Bandnummer: 119

Heftnummer: 21

ISSN: 0021-8979

eISSN: 1089-7550

DOI Link: https://doi.org/10.1063/1.4952982

Verlag: American Institute of Physics

Abstract: 
We report on the preparation and thermoelectric properties of the quaternary system AgPbmBiTe2+m (Bismuth-Lead-Silver-Tellurium, BLST-m) that were nanostructured by mechanical alloying. Nanopowders of various compositions were compacted by three different methods: cold pressing/annealing, hot pressing, and short term sintering. The products are compared with respect to microstructure and sample density. The thermoelectric properties were measured: thermal conductivity in the temperature range from 300K to 800K and electrical conductivity and Seebeck coefficient between 100K and 800 K. The compacting method and the composition had a substantial impact on carrier concentration and mobility as well as on the thermoelectric parameters. Room temperature Hall measurements yielded carrier concentrations in the order of 10(19) cm(-3), slightly increasing with increasing content of the additive silver bismuth telluride to the lead telluride base. ZT values close to the ones of bulk samples were achieved. X-ray diffraction and transmission electron microscopy (TEM) showed macroscopically homogeneous distributions of the constituting elements inside the nanopowders ensembles, indicating a solid solution. However, high resolution transmission electron microscopy (HRTEM) revealed disorder on the nanoscale inside individual nanopowders grains. Published by AIP Publishing.

Harvard-Zitierstil: Falkenbach, O., Schmitz, A., Hartung, D., Dankwort, T., Koch, G., Kienle, L., et al. (2016) Effect of preparation procedure and nanostructuring on the thermoelectric properties of the lead telluride-based material system AgPb_mBiTe_2+m (BLST-m), Journal of Applied Physics, 119(21), Article 214310. https://doi.org/10.1063/1.4952982

APA-Zitierstil: Falkenbach, O., Schmitz, A., Hartung, D., Dankwort, T., Koch, G., Kienle, L., Klar, P., Mueller, E., & Schlecht, S. (2016). Effect of preparation procedure and nanostructuring on the thermoelectric properties of the lead telluride-based material system AgPb_mBiTe_2+m (BLST-m). Journal of Applied Physics. 119(21), Article 214310. https://doi.org/10.1063/1.4952982