Beneficial influence of Ru on the thermoelectric properties of Mo₃Sb₇

International audienceZintl phases have recently been identified as potential thermoelectric materials typified by the discovery of a high thermoelectric figure of merit in the Yb14MnSb11 compound above 1000 K. We report on the synthesis and the thermoelectric properties measurements over a wide temperature range 300–1000 K of other Zintl phases exhibiting a complex crystalline structure, namely, Mo3Sb7 and its related compounds Mo3−xRuxSb7. While the binary compound displays low figure of merit values due to its metallic nature, we show that the partial substitution of Mo by Ru significantly improves its value to reach 0.45 at 1000 K in Mo2.2Ru0.8Sb7

Crystal structure and high temperature thermoelectric properties of the Mo_3-xRu_xSb₇ compounds

International audienceZintl phases are currently focusing great attention for their thermoelectric potential typified by the discovery of a high ZT value in Yb14MnSb11 based compounds. Here, we report on the crystallographic characterization via neutron and X-ray diffraction experiments and on the thermoelectric properties measured in the 300-1000 K temperature range of Mo3Sb7 and its isostructural compounds Mo3-xRuxSb7. Even though Mo3Sb7 displays rather high ZT values given its metallic character, the partial substitution of Mo by Ru improves substantially its thermoelectric properties resulting in a ZT value of ~ 0.45 at 1000 K for x = 0.8

Crystal structure and high temperature thermoelectric properties of the Mo_3-xRu_xSb₇ compounds

International audienceZintl phases are currently focusing great attention for their thermoelectric potential typified by the discovery of a high ZT value in Yb14MnSb11 based compounds. Here, we report on the crystallographic characterization via neutron and X-ray diffraction experiments and on the thermoelectric properties measured in the 300-1000 K temperature range of Mo3Sb7 and its isostructural compounds Mo3-xRuxSb7. Even though Mo3Sb7 displays rather high ZT values given its metallic character, the partial substitution of Mo by Ru improves substantially its thermoelectric properties resulting in a ZT value of ~ 0.45 at 1000 K for x = 0.8