Thermoelectric Properties of Novel Skutterudites with Didymium: DDy (Fe1-xCox) 4Sb12 and DDy (Fe1-xNix) 4Sb12

Autor(en)

Gerda Rogl, Andrij Grytsiv, Ernst Bauer, Peter Franz Rogl, Michael Zehetbauer

Abstrakt

In order to improve the thermoelectric properties via efficient phonon scattering Didymium (DD), a mixture of Pr and Nd, was used as a new filler in ternary skutterudites (Fe1-xCox)4Sb12 and (Fe1-xNix)4Sb12. DD-filling levels have been determined from combined data of X-ray powder diffraction and electron microprobe analyses (EMPA). Thermoelectric properties have been characterized by measurements of electrical resistivity, thermopower and thermal conductivity in the temperature range from 4.3 to 800 K. The effect of nanostructuring in DD0.4Fe2Co2Sb12 was elucidated from a comparison of both micro-powder (ground in a WC-mortar, 10 µm) and nano-powder (ball-milled, 150 nm), both hot pressed under identical conditions. The figure of merit ZT depends on the Fe/Co and Ni/Co-contents, respectively, reaching ZT > 1. At low temperatures the nanostructured material exhibits a higher thermoelectric figure of merit. The Vickers hardness was measured for all samples being higher for the nanostructured material.

Organisation(en)

Institut für Physikalische Chemie, Physik Nanostrukturierter Materialien

Externe Organisation(en)

Technische Universität Wien

Journal

Intermetallics

Band

18

Seiten

57-64

Anzahl der Seiten

8

ISSN

0966-9795

DOI

https://doi.org/10.1016/j.intermet.2009.06.005

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103023 Polymerphysik, 210006 Nanotechnologie, 103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/1118cbaa-64d8-4c7a-880f-5a6bec75b646