Skip to Main content Skip to Navigation
Journal articles

Crossover from Germanite to Renierite-Type Structures in Cu 22– x Zn x Fe 8 Ge 4 S 32 Thermoelectric Sulfides

Abstract : Copper-rich sulfides with the composition Cu 22-x Zn x Fe 8 Ge 4 S 32 (0 ≤ x ≤ 2) have been investigated. The detailed structural study combining powder X-ray diffraction, electron microscopy and Mössbauer spectroscopy shows a crossover from a germanite-type domain for 0 ≤ x ≤ 0.4 to a renierite-type domain for 1.2 ≤ x ≤ 2.0, with a biphasic region for x = 0.8. Both sulfides are p-type thermoelectrics due to the presence of the conductive "Cu-S" network containing univalent copper as a major cationic element. All these sulfides exhibit a semiconducting behavior. However, the renierite-type sulfides show a higher resistivity and a lower thermal conductivity than the germanite ones. As a consequence, the ZT figures of merit are similar for germanite and renierite domains reaching values of around 0.23 at 700 K.
Complete list of metadata

Cited literature [45 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-02354451
Contributor : Pierric Lemoine Connect in order to contact the contributor
Submitted on : Monday, December 9, 2019 - 2:11:13 PM
Last modification on : Tuesday, January 4, 2022 - 5:54:51 AM
Long-term archiving on: : Tuesday, March 10, 2020 - 8:01:09 PM

File

Pavan Kumar et al-2019-Crossov...
Files produced by the author(s)

Identifiers

Citation

Ventrapati Pavan Kumar, Laura Paradis-Fortin, Pierric Lemoine, Gérard Le Caër, Bernard Malaman, et al.. Crossover from Germanite to Renierite-Type Structures in Cu 22– x Zn x Fe 8 Ge 4 S 32 Thermoelectric Sulfides. ACS Applied Energy Materials, ACS, 2019, 2 (10), pp.7679-7689. ⟨10.1021/acsaem.9b01681⟩. ⟨hal-02354451⟩

Share

Metrics

Les métriques sont temporairement indisponibles